10.1 Quantitative. Answer: A Var: 50+


 Joel Cross
 1 years ago
 Views:
Transcription
1 Chapter 10 Energy and Work 10.1 Quantitative 1) A child does 350 J of work while pulling a box from the ground up to his tree house with a rope. The tree house is 4.8 m above the ground. What is the mass of the box? A) 7.4 kg B) 4.4 kg C) 5.6 kg D) 6.7 kg 2) You carry a 7.0 kg bag of groceries 1.2 m above the ground at constant velocity across a 2.2 m room. How much work do you do on the bag in the process? A) 0.0 J B) 82 J C) 151 J D) 128 J 3) A crane lifts a 425 kg steel beam vertically upward a distance of 31 m. How much work does the crane do on the beam if the beam accelerates upward at 1.8 m/s 2? Neglect frictional forces. A) B) C) J J J 5 D) J 1
2 4) A traveler pulls on a suitcase strap at an angle 36 above the horizontal. If 408 J of work are done by the strap while moving the suitcase a horizontal distance of 15 m, what is the tension in the strap? A) 34 N B) 28 N C) 38 N D) 41 N 5) A car drives 5.0 km north, then 7.3 km east, then 7.9 km northeast, all at a constant velocity. If 6 the car had to perform J of work during this trip, what was the magnitude of the average frictional force on the car? A) B) C) D) 2.8 6) You do 138 J of work while pulling your sister back on a swing, whose chain is 5.10 m long, until the swing makes an angle of 32.0 with the vertical. What is your sister s mass? A) 18.2 kg B) 15.5 kg C) 20.9 kg D) 22.6 kg 7) Find the net work done by friction between the ground and the body of a snake slithering in a complete circle of 2.23 m radius. The coefficient of friction between the ground and the snake is 0.23, and the snake s weight is 70.0 N. A) 250 J B) 0 J C) 2400 J D) 490 J 2
3 8) Calculate the kinetic energy of a kg baseball thrown at a velocity of 28 m/s. A) 120 J B) 240 J C) 180 J D) 210 J 9 5 9) J of work are done on a 1228 kg car while it accelerates from 10.0 m/s to some final velocity. Find this final velocity. A) 27.4 m/s B) 21.9 m/s C) 24.7 m/s D) 30.1 m/s 10) A kg car experiences a net force of 9500 N while decelerating from 30.0 m/s to 18.4 m/s. How far does it travel while slowing down? A) 30 m B) 27 m C) 32 m D) 35 m 11) A helicopter descends vertically to land with a speed of 8.0 m/s. If the shock absorbers have an initial length of 0.50 m, they compress to 87% of their original length and the air in the tires absorbs 13% of the initial energy as heat, what is the ratio of the spring constant to the helicopter s mass? Assume one landing gear in the craft. A) 13 Kn/kgm B) 13 N/kgm C) 13 N/kgm D) 1.3 kn/kgm 3
4 12) The frame of a cart has a mass of 30 kg, and the cart rolls on four railroad car wheels, each with a mass of 25 kg. The cart is being ridden at a speed of 5.0 m/s by a 75 kg man. What is its total kinetic energy? (Model the railroad car wheels as solid uniform disks of radius 20 cm.) A) 1900 J B) 1500 J C) 620 J D) 1300 J 13) A spring stretches by 21.0 cm when a 135 N object is attached. What is the weight of a fish that would stretch the spring by 66.8 cm? A) 429 N B) 42 N C) 236 N D) 601 N 14) A prankster drops a water balloon from the top of a building on an unsuspecting person on the sidewalk below. If the balloon is traveling at 32.1 m/s when it strikes a person s head (1.5 m above the ground), how tall is the building? Neglect air resistance. A) 54 m B) 53 m C) 56 m D) 57 m 15) An airplane is observed to be 5.33 km from its takeoff point, at a horizontal distance of 4.90 km. What is the gravitational potential energy of the plane with respect to the ground? The plane s mass is 22.0 metric tons. A) 454 MJ B) 1060 MJ C) 1060 J D) 452 J 4
5 16) A massless spring hangs from the ceiling. How much does its potential energy increase, if a 40.5kg mass is attached to it? The spring constant is 2700 N/m. A) 29 J B) 29 kj C) 58 kj D) 58 J 17) A horizontal springmass system oscillates on a frictionless table. If the ratio of the mass to the spring constant is kg m/n, and the maximum speed of the mass was measured to be m/s, find the maximum extension of the spring. A) 3.2 m B) 3.2 cm C) 0.88 cm D) 88 cm 18) A block slides down a frictionless inclined ramp. If the ramp angle is 21.0 and the length of it is 27.0 m, find the speed of the block as it reaches the end of the ramp, assuming it stated sliding from rest at the top. A) 13.8 m/s B) 190 m/s C) 9.76 m/s D) 22.4 m/s 19) A block starts from rest at the top of a 13.0 inclined plane and encounters a spring, of constant 4.5 kn/m, rigidly attached to the plane. If the block s mass is 64.0 kg and it compresses the spring by 60.0 cm, find the distance the block traveled before it encountered the spring. A) 5.1 m B) 561 cm C) 320 m D) cm 5
6 20) A tennis ball bounces on the floor three times. If each time it loses 21.0% of its energy due to heating, how high does it bounce after the third time, provided we released it 4.6 m from the floor? A) 230 cm B) 23 cm C) 230 mm D) 290 cm 21) A 6.7 kg object moving at 7.3 m/s collides inelastically with a 4.0 kg object which is initially at rest. What percentage of the initial kinetic energy of the system is lost during the collision? A) 37% B) 43% C) 33% D) 30% 22) Two pendulums of equal length l = 0.45 m are suspended from the same point. The pendulum bobs are steel spheres. The first bob is drawn back to make a 35 angle with the vertical. If the first bob has mass 0.25 kg and the second has mass 0.75 kg, how high will the second bob rise above its initial position when struck elastically by the first bob after it is released? A) 2.0 cm B) 1.7 cm C) 2.3 cm D) 2.7 cm 23) A child pulls on a wagon with a force of 75 N. If the wagon moves a total of 42 m in 1.7 min, what is the average power generated by the child, in watts? A) 31 W B) 38 W C) 41 W D) 47 W Var: 29 6
7 24) A car needs to generate 75.0 hp in order to maintain a constant velocity of 29.0 m/s on a flat road. What is the magnitude of the total resistive force acting on the car (due to friction, air resistance, etc.)? 3 A) 1.93 B) 2.59 N C) D) ) Calculate the average power output necessary for a 85.0 kg person to run up a 12.0 m long hillside, which is inclined at 25.0 above the horizontal, in 3.00 s. Express your answer in horsepower. A) 1.89 hp B) 4.46 hp C) 2.84 hp D) 1.13 hp 10.2 True/False 1) As a stone slides down a frictionless icecovered hill, its mechanical energy is conserved but its momentum is not conserved. Answer: TRUE 2) Two cars collide, lock bumpers and eventually slide to a stop due to friction with the roadway. During this entire process, mechanical energy and momentum are both conserved. Answer: FALSE 3) Kinetic energy is conserved only in perfectly elastic collisions, but momentum is conserved in all collisions. Answer: TRUE 4) When a moving object hits a stationary object and causes it to move, some of the moving object s kinetic energy is transformed into momentum in the object that was at rest. Answer: FALSE 7
8 5) If a force acts perpendicular to an object s direction of motion, that force cannot change the object s kinetic energy or momentum. Answer: FALSE 6) A 2.0 kg stone slides from rest down a hill 5.0 m high and is observed to be moving at 6.0 m/s at the bottom. During this process, 62 J of thermal energy have been produced. Answer: TRUE 7) A 3.5 kg mass is pressed against a spring of spring constant 90.0 N/m, compressing it 25.0 cm. The greatest amount of kinetic energy this mass could gain after it is released is 2.81 J. Answer: TRUE 10.3 Conceptual 1) Describe the energy transfers that take place as you use a slingshot to shoot a rock into the air, it rises to a peak, then falls, and finally hits the ground and stops without bouncing. Answer: Chemical energy in your muscles is transformed into elastic potential energy as you stretch the slingshot; the elastic potential energy changes to kinetic energy of the rock as the sling is released; the rock s kinetic energy gradually changes to gravitational potential energy as it rises and stops at its peak; the gravitational potential energy is transformed back into kinetic energy as the rock falls; the rock s kinetic energy changes to heat in the ground and the rock itself, once the rock hits the ground and stops. 2) A child does work to climb to the top of a slide, thus giving herself potential energy. Explain what has happened to all this potential energy as the child, still moving, nears the bottom of the (not frictionless) slide. Answer: Some of the potential energy she had at the top of the slide has been transformed into kinetic energy of her motion; the rest of the PE has been transformed into heat in the slide, the air, and the body of the child. 8
9 3) Particle 1 has 1 the mass of Particle 2, yet they both have the same kinetic energy. Compare the 2 momenta of two particles. Answer: Since the kinetic energies of the two particles are equal, 1 1 mv = m v or p p =, where p= mv. 2m 2m Since m = m, we see that p = p = p ) Is energy conserved during a twocar collision? Answer: It depends how one defines the system to be observed. If the system only accounts for the kinetic energies of the cars, then it is not conserved. If the system accounts for the friction and deformation of the vehicles, then it is conserved. 5) A cannon recoils after it fires a shell. If you measure the range of the shell, can you find the energy released by the gunpowder? Answer: No. During the same time it takes the shell to clear the barrel of the cannon, there are frictional forces acting on it. These are external to the components of the explosion. 6) A rubber ball is dropped from a height h above the ground. Describe the motion of the ball for many bounces if the collision is completely elastic. Answer: If the collision is completely elastic, the ball will continue to bounce to the same height h after every bounce, forever. It should be noted that this is not completely realistic, which implies that the collisions are not 100% elastic in real life. 9
10 7) A person stands on the edge of a cliff. She throws three identical rocks with the same speed. Rock X is thrown vertically upward, rock Y is thrown horizontally, and rock Z is thrown vertically downward. Assuming the elevation loss of the three rocks is the same (the base of the cliff is flat), which rock hits the ground with the highest speed? A) They all hit the ground with the same speed. B) Rock X C) Rock Y D) Rock Z 8) Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed of twice as high as Bill. The maximum height of Joe s ball will be A) four times that of Bill s ball. B) two times that of Bill s ball. C) equal to that of Bill s ball. D) eight times that of Bill s ball. E) roughly 1.3 times that of Bill s ball. 9) A ball can be rolled down one of four different ramps, as shown below. The final elevation loss of each of the ramps is the same. Neglecting friction, for which ramp will the speed of the ball be the highest at the bottom? A) The speed of the ball will be the same for all ramps. B) Ramp X C) Ramp Y D) Ramp Z 10
11 10) A child swings on a ball of mass m on a rope in a uniform, vertical circle of radius r at a constant speed v. How much work is done by the centripetal force on the ball during one complete revolution? Answer: The centripetal force is always directed radially inward. Since theis force is always perpendicular to the displacement of the ball, we can conclude that the centripetal force does no work on the ball. Mathematically, W = Fxcos90 = 0 11) You push a heavy box of mass m up a frictionless inclined plane of length l and height h in some time t 0. Later, you push the same box up a similar inclined plane of length l/2 and height h in the same time t 0. What can you say about the relationship between your power output(s) during these two processes? Assume the box is moved at a constant velocity in both cases. Answer: Your power output was the same in both cases. Since the inclined planes are work mgh frictionless, the total work done is W = mgh. Since Power = =, the power time t 0 is the same in both cases. 12) A pendulum in a grandfather clock swings back and forth. Does the force of gravity do positive work on the pendulum at any point in its trajectory? If so, where? Answer: The force of gravity does positive work on the pendulum while the pendulum is swinging from a highpoint to a lowpoint in its trajectory. The work is positive in this situation because there is a displacement component directed vertically downward (in the same direction as the gravitational force). 13) Viscous friction allows oil to reduce the heating and wear of moving machine parts. But viscous friction depends on velocity. Is that a nonconservative force? Answer: Yes, whatever the functional dependence of a force to other physical quantities, the fact that the frictional effect removes energy (heat) from the moving parts classifies it as a nonconservative force. 14) Two lumps of clay are thrown at each other such that they come completely to rest after the collision. Obviously, kinetic energy is not conserved. Where did the energy go? Answer: The kinetic energy of the two lumps of clay is used up as the pieces of clay deform. Some small amounts are also converted into heat and sound. 11
12 15) If one lifts a box and walks up a couple of floors, how would the change in potential energy be accounted for? Answer: The act of lifting the box gives some gravitational potential energy to the box with respect to the floor. Walking up the stairs increases the gravitational potential of both the worker and the box, with respect to the ground floor. However, the box still has the same potential as when it was lifted, with respect to the worker s feet. 16) Three cars (car F, car G, and car H) are moving with the same velocity, and slam on the brakes. The most massive car is car F, and the least massive is car H. Assuming all three cars have identical tires, which car travels the longest distance to skid to a stop? A) They all travel the same distance in stopping. B) Car F C) Car G D) Car H 17) Two cyclists, who weigh the same and have identical bicycles, ride up the same mountain, both starting at the same time. Joe rides straight up the mountain, and Bob rides up the longer road that has a lower grade. Joe gets to the top before Bob. Which statement is true? A) Ignoring friction and wind resistance, the amount of work done by Joe is equal to the amount of work done by Bob, but the average power exerted by Joe is greater than that of Bob. B) Ignoring friction and wind resistance, the amount of work done by Joe is greater than the amount of work done by Bob, and the average power exerted by Joe is greater than that of Bob. C) Ignoring friction and wind resistance, Bob and Joe exerted the same amount of work, and the average power of each cyclist was also the same. D) Ignoring friction and wind resistance, the average power exerted by Bob and Joe was the same, but Joe exerted more work in getting there. 12
13 18) A person drops one rock from rest and it falls 100 meters down a cliff before hitting the ground. The person then throws an identical rock downward. The amount of kinetic energy gained by the rock dropped from rest is that of the second rock, and the magnitude of the change in speed (between hitting the ground and its initial speed) of the rock dropped from rest is that of the second rock. A) equal to, greater than B) equal to, equal to C) less than, less than D) equal to, less than 13
9. The kinetic energy of the moving object is (1) 5 J (3) 15 J (2) 10 J (4) 50 J
1. If the kinetic energy of an object is 16 joules when its speed is 4.0 meters per second, then the mass of the objects is (1) 0.5 kg (3) 8.0 kg (2) 2.0 kg (4) 19.6 kg Base your answers to questions 9
More informationPhysics 125 Practice Exam #3 Chapters 67 Professor Siegel
Physics 125 Practice Exam #3 Chapters 67 Professor Siegel Name: Lab Day: 1. A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the
More information1) 0.33 m/s 2. 2) 2 m/s 2. 3) 6 m/s 2. 4) 18 m/s 2 1) 120 J 2) 40 J 3) 30 J 4) 12 J. 1) unchanged. 2) halved. 3) doubled.
Base your answers to questions 1 through 5 on the diagram below which represents a 3.0kilogram mass being moved at a constant speed by a force of 6.0 Newtons. 4. If the surface were frictionless, the
More informationAP Physics C Fall Final Web Review
Name: Class: _ Date: _ AP Physics C Fall Final Web Review Multiple Choice Identify the choice that best completes the statement or answers the question. 1. On a position versus time graph, the slope of
More informationChapter 7: Momentum and Impulse
Chapter 7: Momentum and Impulse 1. When a baseball bat hits the ball, the impulse delivered to the ball is increased by A. follow through on the swing. B. rapidly stopping the bat after impact. C. letting
More informationB) 286 m C) 325 m D) 367 m Answer: B
Practice Midterm 1 1) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This means that A) the acceleration is equal to g. B) the force of
More informationPhysics 2A, Sec B00: Mechanics  Winter 2011 Instructor: B. Grinstein Final Exam
Physics 2A, Sec B00: Mechanics  Winter 2011 Instructor: B. Grinstein Final Exam INSTRUCTIONS: Use a pencil #2 to fill your scantron. Write your code number and bubble it in under "EXAM NUMBER;" an entry
More informationF N A) 330 N 0.31 B) 310 N 0.33 C) 250 N 0.27 D) 290 N 0.30 E) 370 N 0.26
Physics 23 Exam 2 Spring 2010 Dr. Alward Page 1 1. A 250N force is directed horizontally as shown to push a 29kg box up an inclined plane at a constant speed. Determine the magnitude of the normal force,
More informationB) 40.8 m C) 19.6 m D) None of the other choices is correct. Answer: B
Practice Test 1 1) Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.60 s and reaches the level of the top of the pole after a total elapsed time
More informationExam 2 is at 7 pm tomorrow Conflict is at 5:15 pm in 151 Loomis
* By request, but I m not vouching for these since I didn t write them Exam 2 is at 7 pm tomorrow Conflict is at 5:15 pm in 151 Loomis There are extra office hours today & tomorrow Lots of practice exams
More informationWork, Energy & Momentum Homework Packet Worksheet 1: This is a lot of work!
Work, Energy & Momentum Homework Packet Worksheet 1: This is a lot of work! 1. A student holds her 1.5kg psychology textbook out of a second floor classroom window until her arm is tired; then she releases
More informationSHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
Exam Name SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 1) A person on a sled coasts down a hill and then goes over a slight rise with speed 2.7 m/s.
More informationPHY231 Section 2, Form A March 22, 2012. 1. Which one of the following statements concerning kinetic energy is true?
1. Which one of the following statements concerning kinetic energy is true? A) Kinetic energy can be measured in watts. B) Kinetic energy is always equal to the potential energy. C) Kinetic energy is always
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The following four forces act on a 4.00 kg object: 1) F 1 = 300 N east F 2 = 700 N north
More informationPhysics: Principles and Applications, 6e Giancoli Chapter 4 Dynamics: Newton's Laws of Motion
Physics: Principles and Applications, 6e Giancoli Chapter 4 Dynamics: Newton's Laws of Motion Conceptual Questions 1) Which of Newton's laws best explains why motorists should buckleup? A) the first law
More informationPHY231 Section 1, Form B March 22, 2012
1. A car enters a horizontal, curved roadbed of radius 50 m. The coefficient of static friction between the tires and the roadbed is 0.20. What is the maximum speed with which the car can safely negotiate
More informationAP Physics  Chapter 8 Practice Test
AP Physics  Chapter 8 Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A single conservative force F x = (6.0x 12) N (x is in m) acts on
More informationWork, Energy and Power Practice Test 1
Name: ate: 1. How much work is required to lift a 2kilogram mass to a height of 10 meters?. 5 joules. 20 joules. 100 joules. 200 joules 5. ar and car of equal mass travel up a hill. ar moves up the hill
More informationCurso20122013 Física Básica Experimental I Cuestiones Tema IV. Trabajo y energía.
1. A body of mass m slides a distance d along a horizontal surface. How much work is done by gravity? A) mgd B) zero C) mgd D) One cannot tell from the given information. E) None of these is correct. 2.
More informationCHAPTER 6 WORK AND ENERGY
CHAPTER 6 WORK AND ENERGY CONCEPTUAL QUESTIONS. REASONING AND SOLUTION The work done by F in moving the box through a displacement s is W = ( F cos 0 ) s= Fs. The work done by F is W = ( F cos θ). s From
More informationKE =? v o. Page 1 of 12
Page 1 of 12 CTEnergy1. A mass m is at the end of light (massless) rod of length R, the other end of which has a frictionless pivot so the rod can swing in a vertical plane. The rod is initially horizontal
More informationChapter 5 Using Newton s Laws: Friction, Circular Motion, Drag Forces. Copyright 2009 Pearson Education, Inc.
Chapter 5 Using Newton s Laws: Friction, Circular Motion, Drag Forces Units of Chapter 5 Applications of Newton s Laws Involving Friction Uniform Circular Motion Kinematics Dynamics of Uniform Circular
More informationPractice Test SHM with Answers
Practice Test SHM with Answers MPC 1) If we double the frequency of a system undergoing simple harmonic motion, which of the following statements about that system are true? (There could be more than one
More information1) The gure below shows the position of a particle (moving along a straight line) as a function of time. Which of the following statements is true?
Physics 2A, Sec C00: Mechanics  Winter 2011 Instructor: B. Grinstein Final Exam INSTRUCTIONS: Use a pencil #2 to ll your scantron. Write your code number and bubble it in under "EXAM NUMBER;" an entry
More informationPHY121 #8 Midterm I 3.06.2013
PHY11 #8 Midterm I 3.06.013 AP Physics Newton s Laws AP Exam Multiple Choice Questions #1 #4 1. When the frictionless system shown above is accelerated by an applied force of magnitude F, the tension
More informationConceptual Questions: Forces and Newton s Laws
Conceptual Questions: Forces and Newton s Laws 1. An object can have motion only if a net force acts on it. his statement is a. true b. false 2. And the reason for this (refer to previous question) is
More informationExam Three Momentum Concept Questions
Exam Three Momentum Concept Questions Isolated Systems 4. A car accelerates from rest. In doing so the absolute value of the car's momentum changes by a certain amount and that of the Earth changes by:
More informationcharge is detonated, causing the smaller glider with mass M, to move off to the right at 5 m/s. What is the
This test covers momentum, impulse, conservation of momentum, elastic collisions, inelastic collisions, perfectly inelastic collisions, 2D collisions, and centerofmass, with some problems requiring
More informationAP Physics 1 Midterm Exam Review
AP Physics 1 Midterm Exam Review 1. The graph above shows the velocity v as a function of time t for an object moving in a straight line. Which of the following graphs shows the corresponding displacement
More informationChapter 6 Work and Energy
Chapter 6 WORK AND ENERGY PREVIEW Work is the scalar product of the force acting on an object and the displacement through which it acts. When work is done on or by a system, the energy of that system
More information1. Newton s Laws of Motion and their Applications Tutorial 1
1. Newton s Laws of Motion and their Applications Tutorial 1 1.1 On a planet far, far away, an astronaut picks up a rock. The rock has a mass of 5.00 kg, and on this particular planet its weight is 40.0
More informationC B A T 3 T 2 T 1. 1. What is the magnitude of the force T 1? A) 37.5 N B) 75.0 N C) 113 N D) 157 N E) 192 N
Three boxes are connected by massless strings and are resting on a frictionless table. Each box has a mass of 15 kg, and the tension T 1 in the right string is accelerating the boxes to the right at a
More informationSupplemental Questions
Supplemental Questions The fastest of all fishes is the sailfish. If a sailfish accelerates at a rate of 14 (km/hr)/sec [fwd] for 4.7 s from its initial velocity of 42 km/h [fwd], what is its final velocity?
More informationWork, Power, Energy Multiple Choice. PSI Physics. Multiple Choice Questions
Work, Power, Energy Multiple Choice PSI Physics Name Multiple Choice Questions 1. A block of mass m is pulled over a distance d by an applied force F which is directed in parallel to the displacement.
More informationChapter 4: Newton s Laws: Explaining Motion
Chapter 4: Newton s Laws: Explaining Motion 1. All except one of the following require the application of a net force. Which one is the exception? A. to change an object from a state of rest to a state
More informationPhysics 1401  Exam 2 Chapter 5NNew
Physics 1401  Exam 2 Chapter 5NNew 2. The second hand on a watch has a length of 4.50 mm and makes one revolution in 60.00 s. What is the speed of the end of the second hand as it moves in uniform circular
More informationMidterm Solutions. mvr = ω f (I wheel + I bullet ) = ω f 2 MR2 + mr 2 ) ω f = v R. 1 + M 2m
Midterm Solutions I) A bullet of mass m moving at horizontal velocity v strikes and sticks to the rim of a wheel a solid disc) of mass M, radius R, anchored at its center but free to rotate i) Which of
More informationP211 Midterm 2 Spring 2004 Form D
1. An archer pulls his bow string back 0.4 m by exerting a force that increases uniformly from zero to 230 N. The equivalent spring constant of the bow is: A. 115 N/m B. 575 N/m C. 1150 N/m D. 287.5 N/m
More information1. The unit of force, a Newton, is equal to a. The amount of mass in an object c. kg m/s b. Mass X Velocity d. kg m/s 2
Forces in Motion Test FORM B Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The unit of force, a Newton, is equal to a. The amount of mass in an object
More information8. Potential Energy and Conservation of Energy Potential Energy: When an object has potential to have work done on it, it is said to have potential
8. Potential Energy and Conservation of Energy Potential Energy: When an object has potential to have work done on it, it is said to have potential energy, e.g. a ball in your hand has more potential energy
More informationTennessee State University
Tennessee State University Dept. of Physics & Mathematics PHYS 2010 CF SU 2009 Name 30% Time is 2 hours. Cheating will give you an Fgrade. Other instructions will be given in the Hall. MULTIPLE CHOICE.
More information2.1 Force and Motion Kinematics looks at velocity and acceleration without reference to the cause of the acceleration.
2.1 Force and Motion Kinematics looks at velocity and acceleration without reference to the cause of the acceleration. Dynamics looks at the cause of acceleration: an unbalanced force. Isaac Newton was
More informationUnits DEMO spring scales masses
Dynamics the study of the causes and changes of motion Force Force Categories ContactField 4 fundamental Force Types 1 Gravity 2 Weak Nuclear Force 3 Electromagnetic 4 Strong Nuclear Force Units DEMO spring
More information5. Forces and MotionI. Force is an interaction that causes the acceleration of a body. A vector quantity.
5. Forces and MotionI 1 Force is an interaction that causes the acceleration of a body. A vector quantity. Newton's First Law: Consider a body on which no net force acts. If the body is at rest, it will
More informationFORCES AND MOTION UNIT TEST. Multiple Choice: Draw a Circle Completely around the ONE BEST answer.
FORCES AND MOTION UNIT TEST Multiple Choice: Draw a Circle Completely around the ONE BEST answer. 1. A force acting on an object does no work if a. a machine is used to move the object. b. the force is
More informationSteps to Solving Newtons Laws Problems.
Mathematical Analysis With Newtons Laws similar to projectiles (x y) isolation Steps to Solving Newtons Laws Problems. 1) FBD 2) Axis 3) Components 4) Fnet (x) (y) 5) Subs 1 Visual Samples F 4 1) F 3 F
More informationPhysics 11 Assignment KEY Dynamics Chapters 4 & 5
Physics Assignment KEY Dynamics Chapters 4 & 5 ote: for all dynamics problemsolving questions, draw appropriate free body diagrams and use the aforementioned problemsolving method.. Define the following
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Exam Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Solve the problem. (Use g = 9.8 m/s2.) 1) A 21 kg box must be slid across the floor. If
More informationInstructor Now pick your pencils up and get this important equation in your notes.
Physics 605 Mechanical Energy (Read objectives on screen.) No, I haven t been playing with this toy the whole time you ve been gone, but it is kind of hypnotizing, isn t it? So where were we? Oh yes, we
More informationWORKSHEET: KINETIC AND POTENTIAL ENERGY PROBLEMS
WORKSHEET: KINETIC AND POTENTIAL ENERGY PROBLEMS 1. Stored energy or energy due to position is known as Potential energy. 2. The formula for calculating potential energy is mgh. 3. The three factors that
More informationWORK DONE BY A CONSTANT FORCE
WORK DONE BY A CONSTANT FORCE The definition of work, W, when a constant force (F) is in the direction of displacement (d) is W = Fd SI unit is the Newtonmeter (Nm) = Joule, J If you exert a force of
More informationAt the skate park on the ramp
At the skate park on the ramp 1 On the ramp When a cart rolls down a ramp, it begins at rest, but starts moving downward upon release covers more distance each second When a cart rolls up a ramp, it rises
More informationChapter 9. particle is increased.
Chapter 9 9. Figure 936 shows a three particle system. What are (a) the x coordinate and (b) the y coordinate of the center of mass of the three particle system. (c) What happens to the center of mass
More informationConservation of Energy Workshop. Academic Resource Center
Conservation of Energy Workshop Academic Resource Center Presentation Outline Understanding Concepts Kinetic Energy Gravitational Potential Energy Elastic Potential Energy Example Conceptual Situations
More informationDifferentiated Physics Practice Questions
Differentiated Physics Practice Questions Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A 100kg cannon at rest contains a 10kg cannon ball. When fired,
More informationMULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Vector A has length 4 units and directed to the north. Vector B has length 9 units and is directed
More informationLecture Presentation Chapter 4 Forces and Newton s Laws of Motion
Lecture Presentation Chapter 4 Forces and Newton s Laws of Motion Suggested Videos for Chapter 4 Prelecture Videos Newton s Laws Forces Video Tutor Solutions Force and Newton s Laws of Motion Class Videos
More informationName Period WORKSHEET: KINETIC AND POTENTIAL ENERGY PROBLEMS. 1. Stored energy or energy due to position is known as energy.
Name Period Date WORKSHEET: KINETIC AND POTENTIAL ENERGY PROBLEMS 1. Stored energy or energy due to position is known as energy. 2. The formula for calculating potential energy is. 3. The three factors
More informationReview Chapters 2, 3, 4, 5
Review Chapters 2, 3, 4, 5 4) The gain in speed each second for a freelyfalling object is about A) 0. B) 5 m/s. C) 10 m/s. D) 20 m/s. E) depends on the initial speed 9) Whirl a rock at the end of a string
More informationChapter 7 Momentum and Impulse
Chapter 7 Momentum and Impulse Collisions! How can we describe the change in velocities of colliding football players, or balls colliding with bats?! How does a strong force applied for a very short time
More informationPHYS 211 FINAL FALL 2004 Form A
1. Two boys with masses of 40 kg and 60 kg are holding onto either end of a 10 m long massless pole which is initially at rest and floating in still water. They pull themselves along the pole toward each
More informationPractice Exam Three Solutions
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01T Fall Term 2004 Practice Exam Three Solutions Problem 1a) (5 points) Collisions and Center of Mass Reference Frame In the lab frame,
More informationName Class Date. You do twice as much work. b. You lift two identical books one meter above the ground.
Exercises 9.1 Work (pages 145 146) 1. Circle the letter next to the correct mathematical equation for work. work = force distance work = distance force c. work = force distance d. work = force distance
More informationChapter 4 Dynamics: Newton s Laws of Motion
Chapter 4 Dynamics: Newton s Laws of Motion Units of Chapter 4 Force Newton s First Law of Motion Mass Newton s Second Law of Motion Newton s Third Law of Motion Weight the Force of Gravity; and the Normal
More information8. As a cart travels around a horizontal circular track, the cart must undergo a change in (1) velocity (3) speed (2) inertia (4) weight
1. What is the average speed of an object that travels 6.00 meters north in 2.00 seconds and then travels 3.00 meters east in 1.00 second? 9.00 m/s 3.00 m/s 0.333 m/s 4.24 m/s 2. What is the distance traveled
More informationKE = ½mv 2 PE = mgh W = Fdcosθ THINK ENERGY! (KE F + PE F ) = (KE 0 + PE 0 ) + W NC. Tues Oct 6 Assign 7 Fri Preclass Thursday
Tues Oct 6 Assign 7 Fri Preclass Thursday Conservation of Energy Work, KE, PE, Mech Energy Power To conserve total energy means that the total energy is constant or stays the same. With Work, we now have
More informationReview Assessment: Lec 02 Quiz
COURSES > PHYSICS GUEST SITE > CONTROL PANEL > 1ST SEM. QUIZZES > REVIEW ASSESSMENT: LEC 02 QUIZ Review Assessment: Lec 02 Quiz Name: Status : Score: Instructions: Lec 02 Quiz Completed 20 out of 100 points
More informationA ball, attached to a cord of length 1.20 m, is set in motion so that it is swinging backwards and forwards like a pendulum.
MECHANICS: SIMPLE HARMONIC MOTION QUESTIONS THE PENDULUM (2014;2) A pendulum is set up, as shown in the diagram. The length of the cord attached to the bob is 1.55 m. The bob has a mass of 1.80 kg. The
More informationExam 1 Review Questions PHY 2425  Exam 1
Exam 1 Review Questions PHY 2425  Exam 1 Exam 1H Rev Ques.doc  1  Section: 1 7 Topic: General Properties of Vectors Type: Conceptual 1 Given vector A, the vector 3 A A) has a magnitude 3 times that
More informationPHYS 117 Exam I. Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
PHYS 117 Exam I Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Car A travels from milepost 343 to milepost 349 in 5 minutes. Car B travels
More information6: Applications of Newton's Laws
6: Applications of Newton's Laws Friction opposes motion due to surfaces sticking together Kinetic Friction: surfaces are moving relative to each other a.k.a. Sliding Friction Static Friction: surfaces
More informationConservative vs. Nonconservative forces Gravitational Potential Energy. Work done by nonconservative forces and changes in mechanical energy
Next topic Conservative vs. Nonconservative forces Gravitational Potential Energy Mechanical Energy Conservation of Mechanical energy Work done by nonconservative forces and changes in mechanical energy
More informationUsing mechanical energy for daily
unit 3 Using mechanical energy for daily activities Physics Chapter 3 Using mechanical energy for daily activities Competency Uses mechanical energy for daytoday activities Competency level 3.1 Investigates
More informationName Period Chapter 10 Study Guide
Name _ Period Chapter 10 Study Guide Modified True/False Indicate whether the statement is true or false. 1. Unbalanced forces do not change an object s motion. 2. Friction depends on the types of surfaces
More informationWork and Energy continued
Chapter 6 Work and Energy continued Requested Seat reassignments (Sec. 1) Gram J14 Weber C22 Hardecki B5 Pilallis B18 Murray B19 White B20 Ogden C1 Phan C2 Vites C3 Mccrate C4 Demonstrations Swinging mass,
More informationRotational Dynamics. Luis Anchordoqui
Rotational Dynamics Angular Quantities In purely rotational motion, all points on the object move in circles around the axis of rotation ( O ). The radius of the circle is r. All points on a straight line
More informationChapter 9. is gradually increased, does the center of mass shift toward or away from that particle or does it remain stationary.
Chapter 9 9.2 Figure 937 shows a three particle system with masses m 1 3.0 kg, m 2 4.0 kg, and m 3 8.0 kg. The scales are set by x s 2.0 m and y s 2.0 m. What are (a) the x coordinate and (b) the y coordinate
More informationWork, Energy and Power
Work, Energy and Power In this section of the Transport unit, we will look at the energy changes that take place when a force acts upon an object. Energy can t be created or destroyed, it can only be changed
More informationquestions: force and motion I
questions: force and motion I problem 1 The figure below is an overhead view of a 12 kg tire that is to be pulled by three ropes. One force (F l, with magnitude 50 N) is indicated. Orient the other two
More informationKinetic Energy (A) stays the same stays the same (B) increases increases (C) stays the same increases (D) increases stays the same.
1. A cart full of water travels horizontally on a frictionless track with initial velocity v. As shown in the diagram, in the back wall of the cart there is a small opening near the bottom of the wall
More informationANSWER KEY. Reviewing Physics: The Physical Setting THIRD EDITION. Amsco School Publications, Inc. 315 Hudson Street / New York, N.Y.
NSWER KEY Reviewing Physics: The Physical Setting THIRD EDITION msco School Publications, Inc. 315 Hudson Street / New York, N.Y. 10013 N 7310 CD Manufactured in the United States of merica 1345678910
More informationChapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued Clicker Question 4.3 A mass at rest on a ramp. How does the friction between the mass and the table know how much force will EXACTLY balance the gravity
More informationName: Partners: Period: Coaster Option: 1. In the space below, make a sketch of your roller coaster.
1. In the space below, make a sketch of your roller coaster. 2. On your sketch, label different areas of acceleration. Put a next to an area of negative acceleration, a + next to an area of positive acceleration,
More informationLab 8: Ballistic Pendulum
Lab 8: Ballistic Pendulum Equipment: Ballistic pendulum apparatus, 2 meter ruler, 30 cm ruler, blank paper, carbon paper, masking tape, scale. Caution In this experiment a steel ball is projected horizontally
More information7. Kinetic Energy and Work
Kinetic Energy: 7. Kinetic Energy and Work The kinetic energy of a moving object: k = 1 2 mv 2 Kinetic energy is proportional to the square of the velocity. If the velocity of an object doubles, the kinetic
More informationHW Set II page 1 of 9 PHYSICS 1401 (1) homework solutions
HW Set II page 1 of 9 450 When a large star becomes a supernova, its core may be compressed so tightly that it becomes a neutron star, with a radius of about 20 km (about the size of the San Francisco
More informationQ1. (a) State the difference between vector and scalar quantities (1)
Q1. (a) State the difference between vector and scalar quantities....... (1) (b) State one example of a vector quantity (other than force) and one example of a scalar quantity. vector quantity... scalar
More informationWorkEnergy Bar Charts
Name: WorkEnergy Bar Charts Read from Lesson 2 of the Work, Energy and Power chapter at The Physics Classroom: http://www.physicsclassroom.com/class/energy/u5l2c.html MOP Connection: Work and Energy:
More informationProjectile Motion 1:Horizontally Launched Projectiles
A cannon shoots a clown directly upward with a speed of 20 m/s. What height will the clown reach? How much time will the clown spend in the air? Projectile Motion 1:Horizontally Launched Projectiles Two
More informationGeneral Physical Science
General Physical Science Chapter 4 Work and Energy Work The work done by a constant force F acting upon an object is the product of the magnitude of the force (or component of the force) and the parallel
More information5.1 Vector and Scalar Quantities. A vector quantity includes both magnitude and direction, but a scalar quantity includes only magnitude.
Projectile motion can be described by the horizontal ontal and vertical components of motion. In the previous chapter we studied simple straightline motion linear motion. Now we extend these ideas to
More informationChapter 4 Dynamics: Newton s Laws of Motion. Copyright 2009 Pearson Education, Inc.
Chapter 4 Dynamics: Newton s Laws of Motion Force Units of Chapter 4 Newton s First Law of Motion Mass Newton s Second Law of Motion Newton s Third Law of Motion Weight the Force of Gravity; and the Normal
More informationChapter 6. Work and Energy
Chapter 6 Work and Energy ENERGY IS THE ABILITY TO DO WORK = TO APPLY A FORCE OVER A DISTANCE= Example: push over a distance, pull over a distance. Mechanical energy comes into 2 forms: Kinetic energy
More informationACTIVITY SIX CONSERVATION OF MOMENTUM ELASTIC COLLISIONS
1 PURPOSE ACTIVITY SIX CONSERVATION OF MOMENTUM ELASTIC COLLISIONS For this experiment, the Motion Visualizer (MV) is used to capture the motion of two frictionless carts moving along a flat, horizontal
More informationPhysics 201 Homework 8
Physics 201 Homework 8 Feb 27, 2013 1. A ceiling fan is turned on and a net torque of 1.8 Nm is applied to the blades. 8.2 rad/s 2 The blades have a total moment of inertia of 0.22 kgm 2. What is the
More informationPhysics 2101, First Exam, Fall 2007
Physics 2101, First Exam, Fall 2007 September 4, 2007 Please turn OFF your cell phone and MP3 player! Write down your name and section number in the scantron form. Make sure to mark your answers in the
More informationPhysics Notes Class 11 CHAPTER 6 WORK, ENERGY AND POWER
1 P a g e Work Physics Notes Class 11 CHAPTER 6 WORK, ENERGY AND POWER When a force acts on an object and the object actually moves in the direction of force, then the work is said to be done by the force.
More informationLesson 3  Understanding Energy (with a Pendulum)
Lesson 3  Understanding Energy (with a Pendulum) Introduction This lesson is meant to introduce energy and conservation of energy and is a continuation of the fundamentals of roller coaster engineering.
More informationIII. Applications of Force and Motion Concepts. Concept Review. Conflicting Contentions. 1. Airplane Drop 2. Moving Ball Toss 3. Galileo s Argument
III. Applications of Force and Motion Concepts Concept Review Conflicting Contentions 1. Airplane Drop 2. Moving Ball Toss 3. Galileo s Argument Qualitative Reasoning 1. Dropping Balls 2. Spinning Bug
More information