Physics 11 Assignment KEY Dynamics Chapters 4 & 5


 Britton Sparks
 1 years ago
 Views:
Transcription
1 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 terms: Inertia  the natural tendency of an object to stay at rest or continue its motion in a straight line at constant speed in the absence of outside forces; objects with greater mass have greater inertia Dynamics  the study of the motions of bodies while considering their masses and the responsible forces Mechanics  the branch of physics comprising kinematics and dynamics; simply, the how and the why of simple motion ewton s Laws of Motion  three fundamental laws of motion which are the basis of ewtonian mechanics are: ) an object will remain at rest or in straightline motion unless acted on by an outside force; ) the acceleration of an object is proportional to the force acting on it and inversely proportional to its mass; 3) for every action force on an object, the object exerts and equal and opposite reaction force Force  an action, like a push or a pull, that causes a change in motion of an object Inertial frame of reference  a frame of reference in which the law of inertia is valid; it is a nonaccelerating frame of reference oninertial frame of reference  an accelerating frame of reference Mass  the quantity of matter an object contains; determined through the inertial properties of an object or its gravitational influence on other objects Inertial mass  the property of matter that resists a change in motion Gravitational mass  the property of matter that determines the strength of the gravitational force Contact force  the force exerted by an object in direct contact with another object oncontact force  the force that acts even though objects are separated by a distance, such as attraction or repulsion between magnets Weight  the force that gravity exerts on an object because of its mass Static frictional force  a frictional force that acts to keep an object at rest; measured as the force required to move an object from rest Kinetic frictional force  a frictional force that acts to slow the motion of an object; measured as the force required to just keep an object sliding over another object Coefficient of friction  the ratio of frictional force to the normal force between two object surfaces ormal force  a force that acts in a direction perpendicular to the common contact surface between two objects et force  the vector sum of all forces acting on an object. Why does a child in a wagon seem to fall backward when you give the wagon a sharp pull? The child tends to remain at rest (ewton s st Law), unless a force acts on her. The force is applied to the wagon, not the child, and so the wagon accelerates out from under the child, making it look like the child falls backwards relative to the wagon. If the child is standing in the wagon, the force of friction between the child and the bottom of the wagon will produce an acceleration of the feet, pulling the feet out from under the child, also making the child fall backwards.
2 3. If the acceleration of a body is zero, are no forces acting on it? If the acceleration of an object is zero, then by ewton s second law, the net force must be zero. There can be forces acting on the object as long as the vector sum of the forces is zero. 4. Why do you push harder on the pedals of a bicycle when first starting out than when moving at a constant speed? You push harder on the pedals of a bicycle when first starting out than when moving at constant velocity because your applied force must overcome static friction. Static friction is greater than kinetic friction. Once the bicycle is moving a constant velocity, less applied force is required to equal kinetic friction. 5. Only one force acts on an object. Can the object have zero acceleration? Can it have zero velocity? If only one force act on an object, then the net force is greater than zero and, according to the nd law of motion, the acceleration cannot be zero and it cannot have zero velocity. 6. The force of gravity on a kg rock is twice as great as that on a kg rock. Why then doesn t the heavier rock fall faster? The acceleration of both rocks is found by dividing their weight (the force of gravity on them) by their mass. The kg rock has a force of gravity on it that is twice as great as the force of gravity on the kg rock, but also twice as great a mass as the kg rock, so the acceleration is the same for both. 7. A person exerts an upward force of 40 to hold a bag of groceries. Describe the reaction force by stating (a) its magnitude, (b) its direction, (c) on what body it is exerted, and (d) by what body it is exerted. (a) The magnitude is 40. (b) The direction is downward. (c) It is exerted on the person. (d) It is exerted by the bag of groceries. 8. Why is the stopping distance of a truck much shorter than for a train going the same speed? The stopping distance for a truck is much shorter than that of a train going the same speed because, even though the rate of slowing down, i.e. acceleration, is the same, the truck s mass is significantly less than the train s mass. Therefore, according to the Second law of motion, a greater force will be required to slow down the train and thus a longer period of time and greater stopping distance. 9. You can hold a heavy box against a rough wall and prevent it from slipping down by pressing only horizontally. How can the application of a horizontal force keep an object from moving vertically? By pressing the block against the rough wall, you increase the normal force of the wall on the block. As the normal force increases, the amount of static friction between the block and the wall increases. This static friction force is vertical and opposes gravity or the
3 weight of the block. Provided that the static friction force equals the force of weight, the block will not slide down the wall. 0. a) A box sits at rest on a rough 30 o inclined plane. Draw free body diagram, showing all the forces acting on the box. b) How does the diagram change if the box were sliding down the plane? c) How does the diagram change if the box were sliding up the plane? (a) (b) (c) In (a) the friction is static and opposes the impending motion down the plane. In (b) the friction is kinetic and opposes the motion down the plane. In (c) the friction is kinetic and opposes the motion up the plane.. What force is needed to accelerate a child on a sled (total mass = 60.0 kg) at.5 m/s? The net force, F net, is due to some applied force, F a, and friction, F f. Since we do not know any of these individual forces, solve for Fnet. Fnet = m a = (60.0 kg)(.5 m/s ) = A net force of 55 accelerates a bike and rider at.0 m/s. What is the mass of the bike and rider? The net force, F net, is due to some applied force, F a, and friction, F f and is 55. F net = m a = F m a net = 55.0 m/s = 6 kg 3. How much tension must a rope withstand if it is used to accelerate a 050kg car horizontally at.0 m/s? Ignore friction.
4 The net force, F net, is due to tension in the rope, F T. F net = F = m a = (050 kg)(.0 m/s ) = 60 T 4. What is the weight of a 66kg astronaut (a) on Earth, (b) on the Moon (g =.7 m/s ), (c) on Mars (g = 3.7 m/s ), and (d) in outer space traveling with constant velocity? The mass remains the same in all four situations, 66 kg, but the weight is different: (a) = m g = (66 kg)(9.8m/s ) = 647 F G (b) F G (c) F G (d) F G = m g = (66 kg)(.7 m/s ) = = m g = (66 kg)(3.7 m/s ) = 44 = m g = (66 kg)(0 m/s ) = 0 5. A 0.0kg box rest on a table. (a) What is the weight of the box and the normal force acting on it? (b) A 0.0kg box is placed on top of the 0.0kg box. Determine the normal force that the table exerts on the 0.0kg box and the normal force that the 0.0kg box exerts on the 0.0kg box. (a) The weight of the box is: FG = m g = (0.0 kg)(9.8m/s ) = 96 The normal force acting on it is: F = F = m g = (0.0 kg)(9.8m/s ) = 96 G (b) We select both objects and apply the Second Law of Motion: F = F = ( m + m ) g = (0.0 kg kg)(9.8m/s ) = 94 G 0 0 If we select the top block as the object, then: F = F = m g = (0.0 kg)(9.8m/s ) = 98.0 G 6. What average force is required to stop an 00kg car in 8.0 s if it is traveling at 90 km/h?
5 The average force required to stop the car would be a combination of the braking force and the frictional force (call it F A ). The acceleration can be found from the car s D motion: v = v + at f i v f vi 0 m/s  5 m/s a = = = 3.3 m/s t 8.0 s We apply the Second Law of Motion: F A = m a = (00 kg)( 3.3 m/s ) = What average force is needed to accelerate a 7.00g pellet from rest to 75 m/s over a distance of m along the barrel of a rifle? The average force required to accelerate Bullet Bill comes from the explosion in the gun (call it F A ). The acceleration can be found: 8. A 0.0kg bucket is lowered by a rope in which there is 63.0 of tension. What is the acceleration of the bucket? Is it up or down? F = F F = m g F = m a net G T T (0 kg)(9.8 m/s ) (63 ) = (0 kg)(a) a = 3.5 m/s ( down) 9. A person stands on a bathroom scale in a motionless elevator. When the elevator begins to move, the scale briefly reads only 0.75 of the person s weight. Calculate the acceleration of the elevator and find the direction of acceleration. The scale reads the force the person exerts on the scale. From the Third Law of Motion, this is also the magnitude of the normal force acting on the person. F F = m a G m g F = m a mg 0.75mg = ma a = = (0.75)(9.8 m/s ).45 m/s ( down)
6 0. If the coefficient of kinetic friction between a 35kg crate and the floor is 0.30, what horizontal force is required to move the crate at a steady speed across the floor? What horizontal force is required if the coefficient of kinetic friction is zero? Because the crate is moving at constant speed, the acceleration is zero. Using the Second Law of Motion for each bucket: F = F  F = 0 net A f F = F = µ F = A f k (0.30)(35 kg)(9.8 m/s )=03 If µ k is reduced to zero then the friction is eliminated and no F A is required to keep the crate moving at constant speed (i.e. First Law of Motion). A force of 40.0 is required to start a 5.0kg box moving across a horizontal concrete floor. (a) What is the coefficient of static friction between the box and the floor? (b) If the force continues, the box accelerates at 0.70 m/s. What is the coefficient of kinetic friction? At the moment the box begins to move, the applied force equals the frictional force and acceleration is instantaneously zero: (a) F = F  F = 0 net A f F = F = µ F = 40.0 A f s Ff 40.0 µ s = = = 0.85 F (5.0 kg)(9.8 m/s ) (b) F = F  F = m a = (5.0 kg)(0.70 m/s ) = 3.5 net A f F = F 3.5 = = 36.5 f A Ff 36.5 µ s = = = F (5.0 kg)(9.8 m/s ). An Atwood machine consists of masses 3.8 kg and 4. kg. What is the acceleration of the masses? What is the tension in the rope? m a = g m m + m = 4. kg 3.8 kg 4. kg kg ( 9.8 m/s ) = 0.49 m/s 3. The smaller mass on an Atwood machine is 5. kg. If the masses accelerate at 4.6 m/s, what is the mass of the second object? What is the tension in the rope?
7 m a = g m a ( m + m ) = g( m m ) am am m m m + am gm m + m ( a g) = m ( a g) = gm a g = m a g = 4.4 kg = am gm gm 4.6 m/s 9.8 m/s = 5. kg 4.6 m/s 9.8 m/s 4. Stacie, who has a mass of 45 kg, starts down a slide that is inclined at an angle of 45 with the horizontal. If the coefficient of kinetic friction between Stacie s shorts and the slide is 0.5, what is her acceleration? 5. You are shadowing a nurse in the emergency room of a local hospital. An orderly wheels in a patient who has been in a very serious accident and has had severe bleeding. The nurse quickly explains to you that in a case like this, the patient s bed will be tilted with the head downward to make sure the brain gets enough blood. She tells you that, for most patients, the largest angle that the bed can be tilted without the patient beginning to slide off is 3.0 from the horizontal. a. On what factor or factors does this angle of tilting depend? The coefficient of static friction between the patient and the bed s sheets. b. Find the coefficient of static friction between a typical patient and the bed s sheets.
8
MULTIPLE 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 information2. (b). The newton is a unit of weight, and the quantity (or mass) of gold that weighs 1 newton is m 1 N
QUICK QUIZZS 1. Newton s second law says that the acceleration of an object is directly proportional to the resultant (or net) force acting on. Recognizing this, consider the given statements one at a
More informationGround Rules. PC1221 Fundamentals of Physics I. Force. Zero Net Force. Lectures 9 and 10 The Laws of Motion. Dr Tay Seng Chuan
PC1221 Fundamentals of Physics I Lectures 9 and 10 he Laws of Motion Dr ay Seng Chuan 1 Ground Rules Switch off your handphone and pager Switch off your laptop computer and keep it No talking while lecture
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 informationIsaac Newton (1642 to 1727) Force. Newton s Three Law s of Motion. The First Law. The First Law. The First Law
Isaac Newton (1642 to 1727) Force Chapter 4 Born 1642 (Galileo dies) Invented calculus Three laws of motion Principia Mathematica. Newton s Three Law s of Motion 1. All objects remain at rest or in uniform,
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 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 informationSerway_ISM_V1 1 Chapter 4
Serway_ISM_V1 1 Chapter 4 ANSWERS TO MULTIPLE CHOICE QUESTIONS 1. Newton s second law gives the net force acting on the crate as This gives the kinetic friction force as, so choice (a) is correct. 2. As
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 informationPhysics I Honors: Chapter 4 Practice Exam
Physics I Honors: Chapter 4 Practice Exam Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following statements does not describe
More informationWhat is a force? Identifying forces. What is the connection between force and motion? How are forces related when two objects interact?
Chapter 4: Forces What is a force? Identifying forces. What is the connection between force and motion? How are forces related when two objects interact? Application different forces (field forces, contact
More informationPhysics 101 Prof. Ekey. Chapter 5 Force and motion (Newton, vectors and causing commotion)
Physics 101 Prof. Ekey Chapter 5 Force and motion (Newton, vectors and causing commotion) Goal of chapter 5 is to establish a connection between force and motion This should feel like chapter 1 Questions
More informationB Answer: neither of these. Mass A is accelerating, so the net force on A must be nonzero Likewise for mass B.
CTA1. An Atwood's machine is a pulley with two masses connected by a string as shown. The mass of object A, m A, is twice the mass of object B, m B. The tension T in the string on the left, above mass
More informationPhysics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion. Physics is about forces and how the world around us reacts to these forces.
Physics 111: Lecture 4: Chapter 4  Forces and Newton s Laws of Motion Physics is about forces and how the world around us reacts to these forces. Whats a force? Contact and noncontact forces. Whats a
More informationphysics 111N forces & Newton s laws of motion
physics 111N forces & Newton s laws of motion forces (examples) a push is a force a pull is a force gravity exerts a force between all massive objects (without contact) (the force of attraction from the
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 informationChapter 5 Newton s Laws of Motion
Chapter 5 Newton s Laws of Motion Force and Mass Units of Chapter 5 Newton s First Law of Motion Newton s Second Law of Motion Newton s Third Law of Motion The Vector Nature of Forces: Forces in Two Dimensions
More informationv v ax v a x a v a v = = = Since F = ma, it follows that a = F/m. The mass of the arrow is unchanged, and ( )
Week 3 homework IMPORTANT NOTE ABOUT WEBASSIGN: In the WebAssign versions of these problems, various details have been changed, so that the answers will come out differently. The method to find the solution
More informationChapter 4. Forces and Newton s Laws of Motion. continued
Chapter 4 Forces and Newton s Laws of Motion continued 4.9 Static and Kinetic Frictional Forces When an object is in contact with a surface forces can act on the objects. The component of this force acting
More informationNewton s Laws of Motion
Physics Newton s Laws of Motion Newton s Laws of Motion 4.1 Objectives Explain Newton s first law of motion. Explain Newton s second law of motion. Explain Newton s third law of motion. Solve problems
More informationCh 6 Forces. Question: 9 Problems: 3, 5, 13, 23, 29, 31, 37, 41, 45, 47, 55, 79
Ch 6 Forces Question: 9 Problems: 3, 5, 13, 23, 29, 31, 37, 41, 45, 47, 55, 79 Friction When is friction present in ordinary life?  car brakes  driving around a turn  walking  rubbing your hands together
More informationCOURSE CONTENT. Introduction. Definition of a Force Effect of Forces Measurement of forces. Newton s Laws of Motion
CHAPTER 13  FORCES COURSE CONTENT Introduction Newton s Laws of Motion Definition of a Force Effect of Forces Measurement of forces Examples of Forces A force is just a push or pull. Examples: an object
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 11 Chapter 4 HW Solutions
Physics 11 Chapter 4 HW Solutions Chapter 4 Conceptual Question: 5, 8, 10, 18 Problems: 3, 3, 35, 48, 50, 54, 61, 65, 66, 68 Q4.5. Reason: No. If you know all of the forces than you know the direction
More informationLecture 6. Weight. Tension. Normal Force. Static Friction. Cutnell+Johnson: 4.84.12, second half of section 4.7
Lecture 6 Weight Tension Normal Force Static Friction Cutnell+Johnson: 4.84.12, second half of section 4.7 In this lecture, I m going to discuss four different kinds of forces: weight, tension, the normal
More information041. Newton s First Law Newton s first law states: Sections Covered in the Text: Chapters 4 and 8 F = ( F 1 ) 2 + ( F 2 ) 2.
Force and Motion Sections Covered in the Text: Chapters 4 and 8 Thus far we have studied some attributes of motion. But the cause of the motion, namely force, we have essentially ignored. It is true that
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 informationChapter 5 Newton s Laws of Motion
Chapter 5 Newton s Laws of Motion Sir Isaac Newton (1642 1727) Developed a picture of the universe as a subtle, elaborate clockwork slowly unwinding according to welldefined rules. The book Philosophiae
More informationPhysics Notes Class 11 CHAPTER 5 LAWS OF MOTION
1 P a g e Inertia Physics Notes Class 11 CHAPTER 5 LAWS OF MOTION The property of an object by virtue of which it cannot change its state of rest or of uniform motion along a straight line its own, is
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 informationChapter 4 Newton s Laws: Explaining Motion
Chapter 4 Newton s s Laws: Explaining Motion Newton s Laws of Motion The concepts of force, mass, and weight play critical roles. A Brief History! Where do our ideas and theories about motion come from?!
More informationSection Review Answers. Chapter 12
Section Review Answers Chapter 12 Section 1 1. Answers may vary. Students should say in their own words that an object at rest remains at rest and an object in motion maintains its velocity unless it experiences
More informationNewton s Laws of Motion
Section 3.2 Newton s Laws of Motion Objectives Analyze relationships between forces and motion Calculate the effects of forces on objects Identify force pairs between objects New Vocabulary Newton s first
More informationNewton s Laws of Motion
Chapter 4 Newton s Laws of Motion PowerPoint Lectures for University Physics, Thirteenth Edition Hugh D. Young and Roger A. Freedman Lectures by Wayne Anderson Goals for Chapter 4 To understand the meaning
More informationExample (1): Motion of a block on a frictionless incline plane
Firm knowledge of vector analysis and kinematics is essential to describe the dynamics of physical systems chosen for analysis through ewton s second law. Following problem solving strategy will allow
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 informationHW#4b Page 1 of 6. I ll use m = 100 kg, for parts bc: accelerates upwards, downwards at 5 m/s 2 A) Scale reading is the same as person s weight (mg).
HW#4b Page 1 of 6 Problem 1. A 100 kg person stands on a scale. a.) What would be the scale readout? b.) If the person stands on the scale in an elevator accelerating upwards at 5 m/s, what is the scale
More informationNewton s Laws PreTest
Newton s Laws PreTest 1.) Consider the following two statements and then select the option below that is correct. (i) It is possible for an object move in the absence of forces acting on the object. (ii)
More informationNewton s Wagon Newton s Laws
Newton s Wagon Newton s Laws What happens when you kick a soccer ball? The kick is the external force that Newton was talking about in his first law of motion. What happens to the ball after you kick it?
More informationNEWTON S LAWS OF MOTION
NEWTON S LAWS OF MOTION Background: Aristotle believed that the natural state of motion for objects on the earth was one of rest. In other words, objects needed a force to be kept in motion. Galileo studied
More informationSection 3 Newton s Laws of Motion
Section 3 Newton s Laws of Motion Key Concept Newton s laws of motion describe the relationship between forces and the motion of an object. What You Will Learn Newton s first law of motion states that
More informationDescribe the relationship between gravitational force and distance as shown in the diagram.
Name Period Chapter 2 The Laws of Motion Review Describe the relationship between gravitational force and distance as shown in the diagram. Assess the information about gravity, mass, and weight. Read
More informationFriction and Newton s 3rd law
Lecture 4 Friction and Newton s 3rd law Prereading: KJF 4.8 Frictional Forces Friction is a force exerted by a surface. The frictional force is always parallel to the surface Due to roughness of both
More informationMass, energy, power and time are scalar quantities which do not have direction.
Dynamics Worksheet Answers (a) Answers: A vector quantity has direction while a scalar quantity does not have direction. Answers: (D) Velocity, weight and friction are vector quantities. Note: weight and
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 informationPHYSICS MIDTERM REVIEW
1. The acceleration due to gravity on the surface of planet X is 19.6 m/s 2. If an object on the surface of this planet weighs 980. newtons, the mass of the object is 50.0 kg 490. N 100. kg 908 N 2. If
More informationRecap. A force is the product of an object s mass and acceleration. Forces are the reason why objects change their velocity. Newton s second law:
Recap A force is the product of an object s mass and acceleration. Forces are the reason why objects change their velocity. Newton s second law: Unit: 1 N = 1 kg m/s 2 Forces are vector quantities, since
More informationPhysics 101. Chapter 5: Newton s Third Law
Physics 101 Today Chapter 5: Newton s Third Law First, let s clarify notion of a force: Previously defined force as a push or pull. Better to think of force as an interaction between two objects. You can
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 informationExplaining Motion:Forces
Explaining Motion:Forces Chapter Overview (Fall 2002) A. Newton s Laws of Motion B. Free Body Diagrams C. Analyzing the Forces and Resulting Motion D. Fundamental Forces E. Macroscopic Forces F. Application
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 informationMOTION AND FORCE: DYNAMICS
MOTION AND FORCE: DYNAMICS We ve been dealing with the fact that objects move. Velocity, acceleration, projectile motion, etc. WHY do they move? Forces act upon them, that s why! The connection between
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 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 informationDynamics Why do objects move as they do? What makes an object at rest, begin to move? What makes a body accelerate or decelerate?
Dynamics Why do objects move as they do? What makes an object at rest, begin to move? What makes a body accelerate or decelerate? What makes an object move in a circle? Force A Force is simply a push
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 information1) A 2) B 3) C 4) A and B 5) A and C 6) B and C 7) All of the movies A B C. PHYS 11: Chap. 2, Pg 2
1) A 2) B 3) C 4) A and B 5) A and C 6) B and C 7) All of the movies A B C PHYS 11: Chap. 2, Pg 2 1 1) A 2) B 3) C 4) A and B 5) A and C 6) B and C 7) All three A B PHYS 11: Chap. 2, Pg 3 C 1) more than
More informationF13HPhysQ5 Practice
Name: Class: Date: ID: A F13HPhysQ5 Practice Multiple Choice Identify the choice that best completes the statement or answers the question. 1. A vector is a quantity that has a. time and direction.
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 informationPhysics 160 Biomechanics. Newton s Laws
Physics 160 Biomechanics Newton s Laws Questions to Think About Why does it take more force to cause an object to start sliding than it does to keep it sliding? Why is a ligament more likely to tear during
More informationCHAPTER 2: NEWTON S 1 ST LAW OF MOTIONINERTIA 08/24/16
CHAPTER 2: NEWTON S 1 ST LAW OF MOTIONINERTIA 08/24/16 HISTORY OF IDEAS ABOUT MOTION Aristotle (384322 BC) o Natural Motion An object will strive to get to its proper place determined by its nature or
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 informationLAB 6  GRAVITATIONAL AND PASSIVE FORCES
L061 Name Date Partners LAB 6  GRAVITATIONAL AND PASSIVE FORCES OBJECTIVES And thus Nature will be very conformable to herself and very simple, performing all the great Motions of the heavenly Bodies
More informationA Review of Vector Addition
Motion and Forces in Two Dimensions Sec. 7.1 Forces in Two Dimensions 1. A Review of Vector Addition. Forces on an Inclined Plane 3. How to find an Equilibrant Vector 4. Projectile Motion Objectives Determine
More informationPhysics Classroom Website Webquest Lisa Peck
Physics Classroom Website Webquest Lisa Peck http://www.physicsclassroom.com/class/newtlaws/newtltoc.html Lesson 1: Newton s 1st Law 1. There are many applications of Newton's first law of motion. Several
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 informationGeneral Physics (PHY 2130)
General Physics (PHY 2130) Lecture 8 Forces Newton s Laws of Motion http://www.physics.wayne.edu/~apetrov/phy2130/ Classical Mechanics Describes the relationship between the motion of objects in our everyday
More informationUNIT 2D. Laws of Motion
Name: Regents Physics Date: Mr. Morgante UNIT 2D Laws of Motion Laws of Motion Science of Describing Motion is Kinematics. Dynamics the study of forces that act on bodies in motion. First Law of Motion
More informationNewton's First Law. Newton s Laws. Page 1 of 6
Newton's First Law Newton s Laws In previous units, the variety of ways by which motion can be described (words, graphs, diagrams, numbers, etc.) was discussed. In this unit (Newton's Laws of Motion),
More informationLecture Outline Chapter 5. Physics, 4 th Edition James S. Walker. Copyright 2010 Pearson Education, Inc.
Lecture Outline Chapter 5 Physics, 4 th Edition James S. Walker Chapter 5 Newton s Laws of Motion Dynamics Force and Mass Units of Chapter 5 Newton s 1 st, 2 nd and 3 rd Laws of Motion The Vector Nature
More informationForces. Lecturer: Professor Stephen T. Thornton
Forces Lecturer: Professor Stephen T. Thornton Reading Quiz: Which of Newton s laws refers to an action and a reaction acceleration? A) First law. B) Second law. C) Third law. D) This is a trick question.
More informationConceptual Physics 11 th Edition
Conceptual Physics 11 th Edition Chapter 5: NEWTON S THIRD LAW OF MOTION This lecture will help you understand: Forces and Interactions Newton s Third Law of Motion Summary of Newton s Laws Vectors Forces
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 informationSummary Notes. to avoid confusion it is better to write this formula in words. time
National 4/5 Physics Dynamics and Space Summary Notes The coloured boxes contain National 5 material. Section 1 Mechanics Average Speed Average speed is the distance travelled per unit time. distance (m)
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 information2.2 NEWTON S LAWS OF MOTION
2.2 NEWTON S LAWS OF MOTION Sir Isaac Newton (16421727) made a systematic study of motion and extended the ideas of Galileo (15641642). He summed up Galileo s observation in his three laws of motion
More information56 Chapter 5: FORCE AND MOTION I
Chapter 5: FORCE AND MOTION I 1 An example of an inertial reference frame is: A any reference frame that is not accelerating B a frame attached to a particle on which there are no forces C any reference
More informationIsaac Newton was a British scientist whose accomplishments included
80 Newton s Laws of Motion R EA D I N G Isaac Newton was a British scientist whose accomplishments included important discoveries about light, motion, and gravity. You may have heard the legend about how
More informationNewton s Laws of Motion
Newton s Laws of Motion Newton s Laws and the Mousetrap Racecar Simple version of Newton s three laws of motion 1 st Law: objects at rest stay at rest, objects in motion stay in motion 2 nd Law: force
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 informationForce. A force is a push or a pull. Pushing on a stalled car is an example. The force of friction between your feet and the ground is yet another.
Force A force is a push or a pull. Pushing on a stalled car is an example. The force of friction between your feet and the ground is yet another. Force Weight is the force of the earth's gravity exerted
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 informationVersion 001 Quest 3 Forces tubman (20131) 1
Version 001 Quest 3 Forces tubman (20131) 1 This printout should have 19 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. l B Conceptual
More informationPhysics Midterm Review. MultipleChoice Questions
Physics Midterm Review MultipleChoice Questions 1. A train moves at a constant velocity of 90 km/h. How far will it move in 0.25 h? A. 10 km B. 22.5 km C. 25 km D. 45 km E. 50 km 2. A bicyclist moves
More informationAP Physics Newton's Laws Practice Test
AP Physics Newton's Laws Practice Test Answers: A,D,C,D,C,E,D,B,A,B,C,C,A,A 15. (b) both are 2.8 m/s 2 (c) 22.4 N (d) 1 s, 2.8 m/s 16. (a) 12.5 N, 3.54 m/s 2 (b) 5.3 kg 1. Two blocks are pushed along a
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 informationLecture 9. Friction in a viscous medium Drag Force Quantified
Lecture 9 Goals Describe Friction in Air (Ch. 6) Differentiate between Newton s 1 st, 2 nd and 3 rd Laws Use Newton s 3 rd Law in problem solving Assignment: HW4, (Chap. 6 & 7, due 10/5) 1 st Exam Thurs.,
More informationChapter 4. Forces and Newton s Laws of Motion
Chapter 4 Forces and Newton s Laws of Motion 4.1 The Concepts of Force and Mass A force is a push or a pull. Contact forces arise from physical contact. Actionatadistance forces do not require contact
More informationLAB 6: GRAVITATIONAL AND PASSIVE FORCES
55 Name Date Partners LAB 6: GRAVITATIONAL AND PASSIVE FORCES And thus Nature will be very conformable to herself and very simple, performing all the great Motions of the heavenly Bodies by the attraction
More information5 Day 5: Newton s Laws and Kinematics in 1D
5 Day 5: Newton s Laws and Kinematics in 1D date Friday June 28, 2013 Readings Knight Ch 2.47, Ch 4.6, 4.8 Notes on Newton s Laws For next time: Knight 5.38 lecture demo car on a track, freefall in
More informationHOW ABOUT THEM APPLES?
Physics 432 Newton s Laws Name Date I. Mass vs. Weight Answer the following questions true or false. F_1. A Newton is a unit of mass. HOW ABOUT THEM APPLES? T 2. Weight is a measure of gravitational force.
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 informationDescribed by Isaac Newton
Described by Isaac Newton States observed relationships between motion and forces 3 statements cover aspects of motion for single objects and for objects interacting with another object An object at rest
More information356 CHAPTER 12 Bob Daemmrich
Standard 7.3.17: Investigate that an unbalanced force, acting on an object, changes its speed or path of motion or both, and know that if the force always acts toward the same center as the object moves,
More informationNewton's laws of motion
Newton's laws of motion Forces Forces as vectors Resolving vectors Explaining motion  Aristotle vs Newton Newton s first law Newton s second law Weight Calculating acceleration Newton s third law Moving
More informationSTUDY GUIDE UNIT 10Newton s Third Law
Name ANSWERS STUDY GUIDE UNIT 10Newton s Third Law Date Agenda HW Tues, Jan 5 Wed., Jan 6 Review Video Read Section 6.16.3 Fill in Reading Notes (p. 2) Worksheet  ActionReaction Pairs (p. 3) Go over
More informationChapter 4: Newton s Laws of Motion
Chapter 4: Newton s Laws of Motion Dynamics: Study of motion and its causes. orces cause changes in the motion of an object. orce and Interactions Definition ( loose ): A force is a push or pull exerted
More informationACTIVITY 1: Gravitational Force and Acceleration
CHAPTER 3 ACTIVITY 1: Gravitational Force and Acceleration LEARNING TARGET: You will determine the relationship between mass, acceleration, and gravitational force. PURPOSE: So far in the course, you ve
More informationFORCES AND NEWTON S LAWS OF MOTION
FORCES AND NEWTON S LAWS OF MOTION 4 Q4.1. Reason: Even if an object is not moving forces can be acting on it. However, the net force must be zero. As an example consider a book on a flat table. The forces
More information