Energy  Key Vocabulary


 Alvin Brown
 5 years ago
 Views:
Transcription
1 Energy  Key Vocabulary Term Potential Energy Kinetic Energy Joules Gravity Definition The energy an object possesses due to its position. PE = mgh The energy an object possesses when it is in motion. KE = ½mv 2 The units used to measure energy and work output The acceleration due to gravity is always constant. The value is 10 m/s 2. Conservation of Energy The energy in a closed system will remain constant throughout. (i.e. the potential energy at the top of a hill will equal the kinetic energy at the bottom when friction is ignored.) 1 P a g e
2 Potential Energy E p = mgh Mass Gravity Height if you double the mass then the PE will Double 10 m/s 2 the value for gravity is Double if you double the height then the PE will Where is the Potential energy the least in the picture below? The person on the swing in the middle because they have the least height. Identify two ways you could increase the potential energy. 1. Increase the mass 2. Increase the height 2 P a g e
3 Kinetic Energy Mass Velocity if you double the mass then the KE will Double Quadruple if you double the velocity then the KE will E k = ½ mv 2 Symbols: E k means Kinetic Energy Units: Joules m means mass Units: kilograms v means velocity Units: m/s If I want to find: Then I need to know: My formula will be: My unit will be: mass & velocity ½ mv 2 Joules Mass velocity & kinetic energy m=2e k /v 2 kg Velocity mass & kinetic energy v= 2E k /m m/s 3 P a g e
4 Energy is one of the fundamental quantities in our universe. The workings of the universe can be viewed from the perspective of energy flowing from one place to another and changing back and forth from one form to another. Examples of Energy 1. A gust of wind. 2. Batteries. 3. A ball at rest on top of a hill. 4. Thermal Energy 5. Kinetic Energy 6. Electrical Energy Units of Energy The Joule is the energy needed to push with a force of one newton over a distance of one meter. Work Work is the transfer of energy that results from applying a force over a distance. Can you create a triangle to help you use this formula? An object that has Energy is able to do work; without energy, it is impossible to do work. In fact, one way to think about energy is as stored work. Sample Problems A person travels 30 meters dragging a suitcase using 100 N of force. How much work is done? d=30 m W = Fd F=100 N W = 100 N 30 m = 3,000 J 1. A car uses 200 N of force from the engine going 1000 meters. How much work is done? (200,000 J) 2. A person travels 30 meters walks with a 100 N suitcase in their arms. How much work is done? (0 J) Potential Energy 4 P a g e
5 Potential Energy: energy due to position. Systems or objects with potential energy are able to exert forces (exchange energy) as they change to other arrangements. The term Gravitational Potential Energy describes the energy of an elevated object. Unless otherwise stated, you can assume potential energy means gravitational potential energy (GPE). (We will often abbreviate it as PE) The units of energy are the same as the units for Work. Sample Problems A spoon is raised 0.2 m above a table. If the spoon has a mass of 0.1 kg, what is the gravitational potential energy associated with the spoon relative to the surface of the table? h=0.2 m E p =mgh m=0.1 kg = 0.1 kg x 10 m/s 2 x 0.2 m = 0.2 Joules g=10 m/s 2 Sean stands on the roof of the school holding his egg drop project, 12 m above the ground. If his device has a mass of 0.5 kg, calculate the potential energy of his device. h=12 m E p =mgh m=0.5 kg = 0.5 kg x 10 m/s 2 x 12 m = 60 Joules g=10 m/s 2 Kinetic Energy Energy of motion is called kinetic energy. Objects that are moving also have the ability to cause change. can easily be transformed into potential energy. The kinetic energy of a basketball tossed upward converts into potential energy as the height increases and therefore loses kinetic energy. The amount of kinetic energy an object has equals the amount of work the object can do by exerting force as it stops. is related to both an object s mass and its speed. 5 P a g e
6 increases as the square of the speed. This means that if you go twice as fast, your energy increases by four times (2 2 = 4). If your speed is three times as fast, your energy is nine times bigger (3 2 = 9). Sample Problems 1. Calculate the kinetic energy of Mr. Beatty s 4 kilogram dog Dakota running at 5 m/s. m= 4 kg E k = ½ mv 2 v = 5 m/s = ½ 4 kg x (5 m/s) 2 = 50 Joules 2. What is the kinetic energy of a 2000 kg race car that is traveling at 45 m/s? m= 2000 kg E k = ½ mv 2 v= 45 m/s =½ (2000) kg x (45 m/s) 2 = 2,025,000 Joules 6 P a g e
7 Conservation of Energy The idea that energy converts from one form into another without a change in the total amount is called the law of conservation of energy. The law states that energy can never be created nor destroyed just converted from one form into another. **The law of conservation of energy is one of the most important laws in physics.** (It applies to not only kinetic and potential energy, but to all forms of energy) THE WAY UP As the ball in picture moves upward, it slows down and loses kinetic energy. Eventually it reaches a point where all the kinetic energy has been converted to potential energy. The ball has moved as high as it will go and its upward speed has been reduced to zero. THE WAY DOWN As the ball falls, its speed increases and its height decreases. The potential energy decreases as it converts into kinetic energy. Sample Problems A 2 kg car moving with a speed of 2 m/sec starts up a hill. How high does the car roll before it stops? KE in the beginning = PE at the end E k = E p ½ mv 2 = mgh ½ (2) kg x (2 m/s) 2 = 2 kg x 10 m/s 2 x??? 4 Joules = 20 x??? Height = 0.2 meters 7 P a g e
8 Class Work 1. Theresa s 5.45 kg dog, Mr. Muggles is napping on top of 2 meter high couch. What is the potential energy of Mr. Muggles? Potential energy m=5.45 kg h=2m g=10 m/s 2 PE=mgh 109 Joules 2. Garfield (mass = 10.5 kg) is sleeping on top of the 3 meter high couch. What is Garfield s potential energy? Potential energy m=10.5 kg h=3 m g=10 m/s 2 PE=mgh 315 Joules 3. A 200 kg pig is standing on top of a 40 meter high muddy hill. What is the pig s potential energy? Potential energy m=200 kg h=40 m g=10 m/s 2 PE=mgh 80,000 Joules 4. Tyler (mass=50kg) is riding in a gokart down maple avenue. a. What is Tyler s kinetic energy if he travels at 2 m/s? m=50 kg v= 2 m/s 100 Joules b. What is Tyler s kinetic energy if he travels at 4 m/s? m=50 kg v= 4 m/s 400 Joules 8 P a g e
9 Group Work 1. Alan, a hot dog vendor, is selling hot dogs on top of a hill (height = 20 m) outside of Petco Park in San Diego California. While talking to a customer, Alan s hot dog cart (m=35 kg) starts to roll down the hill. a. What is the kinetic energy of the cart as it rolls down the hill with a velocity of 3.25 m/s? m=35 kg KE=1/2 mv v= 3.25 m/s Joules b. What is the potential energy at the top of the hill? Potential energy m=35 kg h=20m g=10 m/s 2 PE=mgh 7,000 Joules mass = 35 kg 2. True or False: If the speed of an object doubles, the kinetic energy of the object doubles. False, the kinetic energy would quadruple. 3. At Six Flags there is a 625kg roller coaster car moving at m/s. a. Determine the kinetic energy of the car. m=625 kg v = m/s 1,050, Joules b. If the velocity of the coaster were to double to m/s what would its new Kinetic Energy be? m=625 kg v = m/s 4,200, Joules 4. Mister Diwater, the former platform diver for the Ringling Brother's Circus, had a mass of 70 kg. If her velocity was 20 m/s just prior to hitting the bucket of water then what is her Kinetic Energy? m=70 kg v=20 m/s Ek = J 9 P a g e
10 HomeWork 1. In 1987, the fastest auto race in the United States was the Busch Clash in Daytona, Florida. That year, the winner s average speed was about 88 m/s. If the mass of the car and its driver was 981 kg determine their kinetic energy? m=981 kg v=88 m/s Ek = 3,798,432 J 2. In 1994, Leroy Burrell of the United States set what was then a new world record for the men s 100 m run. He ran the 100 m distance with an average speed of 10.2 m/s. Assuming that he ran with constant speed, and his mass was 65kg, what was Burrell s kinetic energy? m=65 kg v= 10.2 m/s J 3. The fastest helicopter, the Westland Lynx, has a top speed of 111 m/s. If its mass was 3400 kg, what is the helicopter s kinetic energy? m=3400 kg v= 111 m/s 20,945,700 J 4. Susie Maroney from Australia set a women s record in longdistance swimming by swimming 93,625 m in h(convert to seconds). What was Maroney s average speed (in m/s)? If Maroney s mass was 55 kg, what was her kinetic energy? 24 hours = 86,400 seconds V = d/t 93,625 m/86,400 s = 1/08 m/s m=55 kg v= 1.08 m/s J 5. Does doubling the mass OR doubling the speed have the most effect on kinetic energy? Doubling the speed because it would Quadruple the Kinetic Energy 10 P a g e
11 Challenge Section! 1. A 20 kg rock is on the edge of a 100 meter cliff. a. Calculate the potential energy of the rock. ( ) ( ) ( ) b. If the rock falls off the cliff, what is its kinetic energy just before striking the ground? c. What speed does the rock have as it strikes the ground? ( ) 2. Tarzan (mass = 75 kg) has an initial velocity of 12 m/s before he jumps off the ground (h i =0). Once in the air he reaches the apex of his swing (v f = 0 m/s). How high does Tarzan swing assuming no external forces act on him? ( )( ) ( ) ( )( ) 3. A large chunk of ice with mass 15 kg falls from a roof 8 meters above the ground. Find the kinetic energy of the ice when it reaches the ground. What is the speed of the ice when it reaches the ground? ( ) ( )( ) ( )( ) ( ) ( ) 11 P a g e
12 4. A 74 kg student, starting from rest, slides down an 11.8 meter high water slide. How fast is he going at the bottom of the slide? ( ) ( )( ) ( )( ) ( ) ( ) 5. The diagram below shows a 10,000 kg bus traveling on a straight road which rises and falls. The speed of the bus at point A is m/s (60 mph). The engine has been disengaged and the bus is coasting. Friction and air resistance are assumed negligible. The numbers on the left show the altitude above sea level in meters. The letters AF correspond to points on the road at these altitudes. 1. Find the speed of the bus at point B. ( )( ) ( ) ( )( ) ( )( ) ( ) ( ) 2. An evil villian has planted a bomb on the bus. If the speed of the bus falls below m/s (50 mph) the bomb will explode. Will the speed of the bus fall below this value and explode? If you feel the bus will explode, identify the interval in which this occurs. ( ) ( ) ( )( ) ( )( ) ( ) 12 P a g e
13 Name: Period: Date: The Snickers Bar Research Question How many times must I climb the stairs to use the stored energy of a snickers bar? Introduction Introduction: In class we will be discussing work and energy. Energy is the ability to do work. Released energy is called kinetic energy while stored energy is called potential energy. The foods we eat contain stored energy. This energy is in chemical form and is released when we digest the food. The basic unit of food energy is measured in calories. All calories are not equal. There are calories and there are Calories. Calories with the capital C are actually kilocalories and are called large Calories. One Calorie actually equals 1000 calories! The caloric content of food is measured in Calories. Purpose In this activity you will be investigating how much chemical energy is in the food that you eat. Do I really want to eat a Snickers? 1) Your weight in pounds must be converted into Newtons. This is accomplished by multiplying your weight in pounds using the conversion factor 4.45N/pound. Your weight (F g ) in Newtons = Your weight (F g ) in Pounds x 4.45N/pounds = ( pounds) (4.45 N/pound) 2) What was the work done by your legs getting you up the steps? Work Done = Your Weight (N) x 4.16 meters = x 4.16 = J 3) Convert the stored energy in a snickers bar (266 calories) from calories to Joules. 1 calorie = 4186 Joules 266 calories x 4186 Joules = Joules 4) Calculate the number of times you would have to climb the steps to expend the amount of energy stored in a Snickers bar. Joules (joules of energy from step #3) / (work done in step #2) 13 P a g e
Potential / Kinetic Energy Remedial Exercise
Potential / Kinetic Energy Remedial Exercise This Conceptual Physics exercise will help you in understanding the Law of Conservation of Energy, and its application to mechanical collisions. Exercise Roles:
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 information9. 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 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 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 informationGravitational Potential Energy
Gravitational Potential Energy Consider a ball falling from a height of y 0 =h to the floor at height y=0. A net force of gravity has been acting on the ball as it drops. So the total work done on the
More informationWork Energy & Power. September 2000 Number 05. 1. Work If a force acts on a body and causes it to move, then the force is doing work.
PhysicsFactsheet September 2000 Number 05 Work Energy & Power 1. Work If a force acts on a body and causes it to move, then the force is doing work. W = Fs W = work done (J) F = force applied (N) s = distance
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 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 information(and Conservation of Energy)
(and Conservation of Energy) Energy What does the word energy mean to you? (Talk amongst yourselves) Just like always, the physicsdefinition is a little bit different, but we re going to hold off on it
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 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 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 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 informationch 15 practice test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
ch 15 practice test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Work is a transfer of a. energy. c. mass. b. force. d. motion. 2. What
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 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 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 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 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 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 informationPS6.2 Explain the factors that determine potential and kinetic energy and the transformation of one to the other.
PS6.1 Explain how the law of conservation of energy applies to the transformation of various forms of energy (including mechanical energy, electrical energy, chemical energy, light energy, sound energy,
More informationSection 15.1 Energy and Its Forms (pages 446 452)
Section 15.1 and Its Forms (pages 446 452) This section describes how energy and work are related. It defines kinetic energy and potential energy, and gives examples for calculating these forms of energy.
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 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 informationWork, Energy and Power
Name: KEY Work, Energy and Power Objectives: 1. To understand work and its relation to energy. 2. To understand how energy can be transformed from one form into another. 3. To compute the power from the
More informationNEWTON S LAWS OF MOTION
Name Period Date NEWTON S LAWS OF MOTION If I am anything, which I highly doubt, I have made myself so by hard work. Isaac Newton Goals: 1. Students will use conceptual and mathematical models to predict
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 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 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 informationreview/assessment questions
Student Activity Sheet 6 Page 1 Name physics, technology and engineering in automobile racing review/assessment questions 1. Draw a freebody diagram for a block being pushed across the floor. 2. Use all
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 information10.1 Quantitative. Answer: A Var: 50+
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
More informationLeaPS Workshop March 12, 2010 Morehead Conference Center Morehead, KY
LeaPS Workshop March 12, 2010 Morehead Conference Center Morehead, KY Word Bank: Acceleration, mass, inertia, weight, gravity, work, heat, kinetic energy, potential energy, closed systems, open systems,
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 informationWhat Is Energy? Energy and Work: Working Together. 124 Chapter 5 Energy and Energy Resources
1 What You Will Learn Explain the relationship between energy and work. Compare kinetic and potential energy. Describe the different forms of energy. Vocabulary energy kinetic energy potential energy mechanical
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 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 information1. Mass, Force and Gravity
STE Physics Intro Name 1. Mass, Force and Gravity Before attempting to understand force, we need to look at mass and acceleration. a) What does mass measure? The quantity of matter(atoms) b) What is the
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 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 informationIn science, energy is the ability to do work. Work is done when a force causes an
What is energy? In science, energy is the ability to do work. Work is done when a force causes an object to move in the direction of the force. Energy is expressed in units of joules (J). A joule is calculated
More informationSpeed A B C. Time. Chapter 3: Falling Objects and Projectile Motion
Chapter 3: Falling Objects and Projectile Motion 1. Neglecting friction, if a Cadillac and Volkswagen start rolling down a hill together, the heavier Cadillac will get to the bottom A. before the Volkswagen.
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 3.8 & 6 Solutions
Chapter 3.8 & 6 Solutions P3.37. Prepare: We are asked to find period, speed and acceleration. Period and frequency are inverses according to Equation 3.26. To find speed we need to know the distance traveled
More informationEnergy What is Energy? Energy is the ability to do work. Any object that has energy has the ability to create force. Energy is one of the fundamental building blocks of our universe. Energy appears in
More informationModified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true.
ch 7 and 16 review Modified True/False Indicate whether the statement is true or false. If false, change the identified word or phrase to make the statement true. 1. The heat released by a burning candle
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 informationEDUH 1017  SPORTS MECHANICS
4277(a) Semester 2, 2011 Page 1 of 9 THE UNIVERSITY OF SYDNEY EDUH 1017  SPORTS MECHANICS NOVEMBER 2011 Time allowed: TWO Hours Total marks: 90 MARKS INSTRUCTIONS All questions are to be answered. Use
More informationForces. When an object is pushed or pulled, we say that a force is exerted on it.
Forces When an object is pushed or pulled, we say that a force is exerted on it. Forces can Cause an object to start moving Change the speed of a moving object Cause a moving object to stop moving Change
More informationCh 7 Kinetic Energy and Work. Question: 7 Problems: 3, 7, 11, 17, 23, 27, 35, 37, 41, 43
Ch 7 Kinetic Energy and Work Question: 7 Problems: 3, 7, 11, 17, 23, 27, 35, 37, 41, 43 Technical definition of energy a scalar quantity that is associated with that state of one or more objects The state
More informationChapter 7 WORK, ENERGY, AND Power Work Done by a Constant Force Kinetic Energy and the WorkEnergy Theorem Work Done by a Variable Force Power
Chapter 7 WORK, ENERGY, AND Power Work Done by a Constant Force Kinetic Energy and the WorkEnergy Theorem Work Done by a Variable Force Power Examples of work. (a) The work done by the force F on this
More informationWork. Work = Force x parallel distance (parallel component of displacement) F v
Work Work = orce x parallel distance (parallel component of displacement) W k = d parallel d parallel Units: N m= J = " joules" = ( kg m2/ s2) = average force computed over the distance r r When is not
More informationUNIT 2 GCSE PHYSICS 2.2.1 Forces and Energy 2011 FXA WORK DONE (J) = ENERGY TRANSFERRED (J) WORK
29 When a force causes an object to move through a distance, work is done. Work done, force and distance are related by the equation : W = F x d WORK When a force is applied to an object and cause it to
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 information4 Gravity: A Force of Attraction
CHAPTER 1 SECTION Matter in Motion 4 Gravity: A Force of Attraction BEFORE YOU READ After you read this section, you should be able to answer these questions: What is gravity? How are weight and mass different?
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 informationProving the Law of Conservation of Energy
Table of Contents List of Tables & Figures: Table 1: Data/6 Figure 1: Example Diagram/4 Figure 2: Setup Diagram/8 1. Abstract/2 2. Introduction & Discussion/3 3. Procedure/5 4. Results/6 5. Summary/6 Proving
More informationWeight The weight of an object is defined as the gravitational force acting on the object. Unit: Newton (N)
Gravitational Field A gravitational field as a region in which an object experiences a force due to gravitational attraction Gravitational Field Strength The gravitational field strength at a point in
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 informationChapter 07 Test A. Name: Class: Date: Multiple Choice Identify the choice that best completes the statement or answers the question.
Class: Date: Chapter 07 Test A Multiple Choice Identify the choice that best completes the statement or answers the question. 1. An example of a vector quantity is: a. temperature. b. length. c. velocity.
More informationUnit 3 Work and Energy Suggested Time: 25 Hours
Unit 3 Work and Energy Suggested Time: 25 Hours PHYSICS 2204 CURRICULUM GUIDE 55 DYNAMICS Work and Energy Introduction When two or more objects are considered at once, a system is involved. To make sense
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 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 informationCh 8 Potential energy and Conservation of Energy. Question: 2, 3, 8, 9 Problems: 3, 9, 15, 21, 24, 25, 31, 32, 35, 41, 43, 47, 49, 53, 55, 63
Ch 8 Potential energ and Conservation of Energ Question: 2, 3, 8, 9 Problems: 3, 9, 15, 21, 24, 25, 31, 32, 35, 41, 43, 47, 49, 53, 55, 63 Potential energ Kinetic energ energ due to motion Potential energ
More informationBHS Freshman Physics Review. Chapter 2 Linear Motion Physics is the oldest science (astronomy) and the foundation for every other science.
BHS Freshman Physics Review Chapter 2 Linear Motion Physics is the oldest science (astronomy) and the foundation for every other science. Galileo (15641642): 1 st true scientist and 1 st person to use
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 informationObjective: Work Done by a Variable Force Work Done by a Spring. Homework: Assignment (125) Do PROBS # (64, 65) Ch. 6, + Do AP 1986 # 2 (handout)
Double Date: Objective: Work Done by a Variable Force Work Done by a Spring Homework: Assignment (125) Do PROBS # (64, 65) Ch. 6, + Do AP 1986 # 2 (handout) AP Physics B Mr. Mirro Work Done by a Variable
More informationThe Physics of Kicking a Soccer Ball
The Physics of Kicking a Soccer Ball Shael Brown Grade 8 Table of Contents Introduction...1 What actually happens when you kick a soccer ball?...2 Who kicks harder shorter or taller people?...4 How much
More informationPractice final for Basic Physics spring 2005 answers on the last page Name: Date:
Practice final for Basic Physics spring 2005 answers on the last page Name: Date: 1. A 12 ohm resistor and a 24 ohm resistor are connected in series in a circuit with a 6.0 volt battery. Assuming negligible
More information1 of 7 9/5/2009 6:12 PM
1 of 7 9/5/2009 6:12 PM Chapter 2 Homework Due: 9:00am on Tuesday, September 8, 2009 Note: To understand how points are awarded, read your instructor's Grading Policy. [Return to Standard Assignment View]
More informationL9 Conservation of Energy, Friction and Circular Motion. Kinetic energy. conservation of energy. Potential energy. Up and down the track
L9 Conseration of Energy, Friction and Circular Motion Kinetic energy, potential energy and conseration of energy What is friction and what determines how big it is? Friction is what keeps our cars moing
More informationWWW.MIAMIBESTMATHTUTOR.COM EMAIL: MIAMIMATHTUTOR@GMAIL.COM CONTACT NUMBER: (786)5564839 PHYSICS I
WWW.MIAMIBESTMATHTUTOR.COM PAGE 1 OF 10 WWW.MIAMIBESTMATHTUTOR.COM EMAIL: MIAMIMATHTUTOR@GMAIL.COM CONTACT NUMBER: (786)5564839 PHYSICS I PROJECTILE MOTION 4.1 1. A physics book slides off a horizontal
More informationWhat is Energy? What is the relationship between energy and work?
What is Energy? What is the relationship between energy and work? Compare kinetic and potential energy What are the different types of energy? What is energy? Energy is the ability to do work. Great, but
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 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 informationKINETIC AND POTENTIAL ENERGY
UNIT 1  ENERGY SECTION 1  ENERGEIA Background Information Energy can be in one of two states: potential or kinetic. Energy can be transferred from potential to kinetic and between objects. Potential
More informationChapter 6. Work and Energy
Chapter 6 Work and Energy The concept of forces acting on a mass (one object) is intimately related to the concept of ENERGY production or storage. A mass accelerated to a nonzero speed carries energy
More informationPhysics 1A Lecture 10C
Physics 1A Lecture 10C "If you neglect to recharge a battery, it dies. And if you run full speed ahead without stopping for water, you lose momentum to finish the race. Oprah Winfrey Static Equilibrium
More informationNewton s Laws. Physics 1425 lecture 6. Michael Fowler, UVa.
Newton s Laws Physics 1425 lecture 6 Michael Fowler, UVa. Newton Extended Galileo s Picture of Galileo said: Motion to Include Forces Natural horizontal motion is at constant velocity unless a force acts:
More informationBounce! Name. Be very careful with the balls. Do not throw them DROP the balls as instructed in the procedure.
Bounce 1 Name Bounce! Be very careful with the balls. Do not throw them DROP the balls as instructed in the procedure. Background information: Energy causes things to happen. During the day, the sun gives
More informationTEACHER ANSWER KEY November 12, 2003. Phys  Vectors 11132003
Phys  Vectors 11132003 TEACHER ANSWER KEY November 12, 2003 5 1. A 1.5kilogram lab cart is accelerated uniformly from rest to a speed of 2.0 meters per second in 0.50 second. What is the magnitude
More informationPage Topic Further Support Materials
This booklet will discuss some of the principles involved in the design of a roller coaster. It is intended for the middle or high school teacher. Physics students may find the information helpful as well.
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 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 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 informationNewton s Laws Quiz Review
Newton s Laws Quiz Review Name Hour To be properly prepared for this quiz you should be able to do the following: 1) state each of Newton s three laws of motion 2) pick out examples of the three laws from
More information7 TH GRADE SCIENCE REVIEW
7 TH GRADE SCIENCE REVIEW The motion of an object is always judged with respect to some other object or point. When an object changes position over time relative to a reference point, the object is in
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 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 information2After completing this chapter you should be able to
After completing this chapter you should be able to solve problems involving motion in a straight line with constant acceleration model an object moving vertically under gravity understand distance time
More informationUnit 4 Practice Test: Rotational Motion
Unit 4 Practice Test: Rotational Motion Multiple Guess Identify the letter of the choice that best completes the statement or answers the question. 1. How would an angle in radians be converted to an angle
More informationLesson 39: Kinetic Energy & Potential Energy
Lesson 39: Kinetic Energy & Potential Energy Total Mechanical Energy We sometimes call the total energy of an object (potential and kinetic) the total mechanical energy of an object. Mechanical energy
More informationGiancoli 6th Edition Problem Solutions Chapter #6
Giancoli 6th Edition Problem Solutions Chapter #6 ü Problem #3 QUESTION: A 1300 Nt crate rests on the floor. How much work is required to move it at constant speed (a) 4.0 m along the floor against a friction
More informationConservation of Energy Physics Lab VI
Conservation of Energy Physics Lab VI Objective This lab experiment explores the principle of energy conservation. You will analyze the final speed of an air track glider pulled along an air track by a
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 informationLecture 07: Work and Kinetic Energy. Physics 2210 Fall Semester 2014
Lecture 07: Work and Kinetic Energy Physics 2210 Fall Semester 2014 Announcements Schedule next few weeks: 9/08 Unit 3 9/10 Unit 4 9/15 Unit 5 (guest lecturer) 9/17 Unit 6 (guest lecturer) 9/22 Unit 7,
More informationTeacher notes/ activities. Gravity is the attractive force between all objects in the universe. It is the force that pulls objects to the earth.
Gravity and forces unit Teacher notes/ activities Gravity is the attractive force between all objects in the universe. It is the force that pulls objects to the earth. Galileo, a famous Italian scientist
More informationWork and Energy. Work = Force Distance. Work increases the energy of an object. Energy can be converted back to work.
Work and Energy Ch. 6 Work = Force Distance Work increases the energy of an object. Energy can be converted back to work. Therefore, energy and work have the same unit: Newton meter = Nm Energy per gram,
More information