Newton s Laws of Motion. Chapter 4


 Janel Grant
 9 months ago
 Views:
Transcription
1 Newton s Laws of Motion Chapter 4
2 Changes in Motion Section 4.1 Force is simply a push or pull It is an interaction between two or more objects Force is a vector so it has magnitude and direction In the SI system, Force is measured in Newtons (N). In the English system, it is measured in pounds. 1 pound = Newtons The total force (or net force) exerted on an object is the vector sum of all forces acting on it
3 Aristotle & Galileo Aristotle was a great philosopher but not such a good scientist. Aristotle s theory of motion is wrong. Took 2000 years before Galileo got motion right.
4 Motion according to Aristotle (I) Every object has a natural state. In natural motion, Earth elements (stone, apple, you, etc.) are drawn to the Earth. Heavier objects are more strongly attracted so they fall faster (stone falls faster than a feather). Aristotle Important: These are Aristotle s ideas, but he s wrong! Reality
5 Motion according to Aristotle (II) Pushing or pulling an object causes unnatural motion (or violent motion). If cause is removed (stop pushing) then object returns to natural state and stops moving. Pushed brick slides but then comes to a stop BRICK BRICK
6 Galileo s Inclines (I) Downhill: Speed increases Uphill: Speed decreases Flat surface: Speed increases, decreases, or constant? Questions existence of natural Earth state of not moving.
7 Inertia section 4.2 An object s tendency to persist in its original state of motion This concept was first discovered by Galileo in the 1630 s. Objects will keep doing whatever they re already doing unless something causes it to change.
8 Isaac Newton , Lincolnshire, England Professor and Scholar at the University of Cambridge One of the most influential scientists of all time Uncovered universal laws of motion and gravity among many other discoveries. Most famous work: Principia
9 Newton s First Law of Motion also referred to as the law of inertia An object at rest remains at rest & an object in motion remains in motion*, unless an outside, unbalanced force acts on the object. *Moving in a straight line with constant speed.
10 Newton s First Law of Motion An object in motion can still maintain its state with a force acting on it. It s only when the forces acting on it are unbalanced that an object can change its motion!
11 Newton s First Law of Motion The Gare Montparnasse in France crashed through this wall in 1895, why? Trains are difficult to stop because they are so massive There is a direct relationship between mass and inertia.
12 Mass Mass is a measure of the quantity of matter in an object Mass also measures how difficult it is to change the velocity of an object Or, how much an object resists changes in its motion
13 Example: Riding the subway When a moving train stops, you continue moving forward. When the stopped train starts moving again, you remain stationary and are thrown backwards
14 Question When the rocket engines on a spacecraft are suddenly turned off, while traveling in empty space far away from distant stars and planets, the starship will.. A) go faster and faster B) slow down and then stop C)stop immediately D)move with constant speed E) move perpendicular to velocity
15 Inertia demonstrations Coin/notecard Tablecloth Hanging mass Hoop and battery Mallet and mass Rolling carts
16 Discussion topics of inertia Inertia videos Getting ketchup out When are you taller? AM or PM? Collisions: Front and rear Seatbelts work off inertia If you drop something on a moving vehicle, where does it land? How do you find your mass in space?
17 Conceptual Checkpoint The metal head of a hammer is loose. To tighten it, you drop the hammer down onto a table. Should you (a) drop the hammer with the handle end down, (b) drop the hammer with the head end down, or (c) do you get the same result either way?
18 Conceptual Checkpoint Tighten the Hammer Head
19 Net Force ( F) When several forces act on an object, the forces add together. Sum of forces called net force or total force 3 Newtons 5 Newtons BRICK same as 8 Newtons The Newton is metric unit of force (about 1/5 pound).
20 Check Yourself?
21 Equilibrium Rule If an object is at rest then the net force must be zero. Similarly if in uniform motion. 3 Newtons 3 Newtons BRICK same as Zero Newtons (No Force) When this happens we say that forces balance.
22 What is... Mass Weight, w
23 Weight vs Mass Mass is the amount of matter in an object Weight is a measure of the pull of gravity on an object. Weight (Newtons) = mass (kg) x acceleration due to gravity (m/s 2 ) Formula for weight: W = m g Q: How much does one kilogram weigh? A: 9.8 N
24 Question Is it better to have 1 N of gold on the moon or on the Earth?
25 Example An astronaut with a mass of 75 kg travels to Mars. A) What is his mass on Mars? B) What is his weight on Mars where the acceleration due to gravity is 3.8 m/sec 2? C) What is the acceleration due to gravity on top of a mountain if he weighs 683 N?
26 Free Body Diagrams A free body diagram is a diagram showing an object in free space along with all external forces acting on it
27 Free Body Diagrams The usual steps in constructing a freebody diagram are: Sketch the forces Isolate the object of interest Choose a convenient coordinate system Resolve the forces into components You can then apply Newton s 2 nd law for each coordinate direction
28 Constructing and Using a FreeBody Diagram
29 Figure 55bc Constructing and Using a FreeBody Diagram
30 Constructing and Using a FreeBody Diagram
31 A Book Supported in a Person s Hand
32 Example Find the magnitude and direction of the net force. 23N 45 N
33 Example Find the magnitude and direction of the net force. 15 N 13 N 24 N
34 Example Four forces act on an object. 210 N acts to the East. 305 N acts to the South. 413 N acts to the West. And, 139 N acts to the North. Find the magnitude and direction of the net force.
35 Example Three forces act on an object. 71 N act at 24 degrees North of East. 62 N act at 51 degrees North of West. And, 85 N act at 60 degrees South of West. Find the magnitude and direction of the net force.
36 Example The following object is in equilibrium. How big does the missing force have to be to keep it in equilibrium? F=? 16 N 16 N 11 N
37 Example Find the size and direction of the missing force in order for this object to be in equilibrium. 3.3 N F =? 6.3 N
38 Example Find the size and direction of the missing force in order for this object to be in equilibrium. 33 N at 60 degrees N of E F =? 63 N at 15 degrees S of E
39 Example This 1kg mass is suspended by two cables at 50 degrees. Find the size and direction of the tension force in each cable in order for this object to be in equilibrium. T=? T=? kg
40 Newton s 2 nd Law Section 4.3 When a net force acts on an object of mass m, the acceleration of the object will be given by: ΣF = ma Or in terms of components: F x ma x F y ma y
41 Newton s 2 nd Law If the net force is zero, the acceleration is zero, and the velocity of an object stays constant, which is Newton s 1 st law Force is measured in newtons (N), and from the second law, 1 N 1kg m/s 2
42 Newton s Second Law of Motion F net = ma 4.45 N = 1 lb
43 Example What is the net force required to accelerate a 1.5 kg box at 2.0 m/sec 2?
44 Example What is the net force exerted on a 1500 kg car if it is accelerated from 5 m/sec to 10 m/sec in 3 sec?
45 Example A 0.34 kg softball is accelerated from rest to 22 m/s over a length of 0.88 meters. Find the net force that was applied to the ball that produced this acceleration.
46 Example The following forces act on the 4.6 kg object. A) Find the net force acting on it. B) Find the magnitude of its acceleration. 15 N 13 N 24 N 4 N
47 Example Find the acceleration of the apparatus below. Assume there is no friction. 3.3 kg 0.75 kg
48 Example A 2,360 kg pickup truck slows down to a complete stop with a frictional force of 14,500 N directed opposite its motion. If its initial velocity was m/s, how far did it travel while slowing down? How much time did this take?
49 Newton s 3 rd Law
50 Newton s 3 rd Law For every force that acts on an object, there is a reaction force equal in magnitude and opposite in direction. For every action there is an equal and opposite reaction. An isolated force does not exist in nature, so forces always occur in pairs
51 Newton s 3 rd Law Action reaction forces act on two different objects: hence they do not cancel Action reaction forces generally produce different accelerations, since the masses of the objects are likely to be different
52 Examples of ActionReaction Force Pairs
53 Apparent Weight When you are in an elevator accelerating upward a scale would read a greater weight When you are in an elevator accelerating downward a scale would read a lesser weight Thus, your apparent weight in an accelerator is different from your true weight
54 Apparent Weight
55 Apparent Weight If you are accelerating upward, your apparent weight is W a m( g a) If you are accelerating downward, your apparent weight is W a m( g a)
56 Normal Forces When an object rests on a surface, the surface provides a force on the object in a direction perpendicular to the surface This called the normal force, N In most cases, the normal force is equal to the weight of the object; however it can be greater or less than the weight of the object
57 Support (Normal) Force Solid surfaces exert a force, called a support force, on objects pressed against them. 100 Newton Gold Brick Downward force (weight) balanced by upward force (support). 100 Newton Support force (Normal Force) * The term normal means perpendicular. So the normal force is always perpendicular to the surfaces
58 The Normal Force May Equal the Weight
59 Normal Forces When a box is pulled by a force F at an angle θ across a smooth floor, the magnitude of the normal force is N W F sin
60 The Normal Force May Differ from the Weight in certain circumstances
61 Normal Forces For an inclined plane, the normal forces are still at right angles to the surface, but not in the vertical direction It is convenient to choose the x axis parallel to the incline surface and y axis perpendicular Then normal force is: N W cos
62 Components of the Weight on an Inclined Surface
63 Example A child of mass 45 kg rides on a sled down an icecovered hill (frictionless) inclined at an angle of 22 degrees with respect to the horizontal. A) What is the acceleration of the child? B) What is the normal force exerted on the child by the sled?
64 Driving down the road you hit the brakes suddenly. As a result, your body moves toward the front of the car. Explain, using Newton s laws.
65 A dragracing car accelerates forward because of the force exerted on it by the road. Why, then, does it need an engine? Explain.
66 An astronaut on a space walk discovers that his jet pack no longer works, leaving him stranded 50 m from the spacecraft. If the jet pack is removable, explain how the astronaut can still use it to return to the ship.
67 Is it possible for an object to be in motion and yet have zero net force acting on it? Explain.
68 You are dribbling a basketball, ready to make your move to the hoop. What produces the force that causes the ball to return to your hand with each dribble?
69 You jump out of an airplane and open your parachute after a brief period of free fall. To decelerate your fall, must the force exerted on you by the parachute be less than, equal to, or greater than your weight? Explain.
70 Is it possible for an object at rest to have only a single force acting on it? If your answer is yes, provide an example. If your answer is no, explain why not.
71 Since all objects are weightless for an astronaut in orbit, is it possible for astronauts to tell whether an object is heavy or light? Explain.
72 Everyday Forces Section 4.4 Two types of Friction Static Kinetic
73 Friction Friction is the force that opposes motion when two surfaces are in contact Opposes motion means that the force of friction is always in the opposite direction of the motion There are two different types of friction: static and kinetic (sliding)
74 Static Friction Static means stationary or not moving When a force is first applied to an object, static friction opposes the start of motion A force greater than that of static friction must be applied for the object to start moving
75 Kinetic Friction Kinetic means related to motion Kinetic friction opposes motion once an object is moving Kinetic friction in general is less than static friction This means you have to push harder to start an object moving than to keep an object moving
76 What Affects Friction? Speed of pull? (assuming v>0) Area in contact? Weight of object? Materials in contact?
77 F f = F N s > k is the coefficient of friction
78 What if...? F A < F f F A = F f F A > F f F f is NOT an applied force!!
79
80 Question It's more difficult to start moving a heavy carton from rest than it is to keep pushing it with constant velocity, because A) the normal force (N) is greater when the carton is at rest. B) s < k C) initially, the normal force (N) is not perpendicular to the applied force. D) k < s
81 Example A 13.4 kg crate is pushed across a floor. The respective coefficients of friction are µ s = 0.85 and µ k = Find the pushing force necessary to get it moving from rest. And, find the force necessary to keep it moving at a constant velocity kg
Physics: 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 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 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 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 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 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 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 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 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 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 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 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 informationPHYSICS 149: Lecture 4
PHYSICS 149: Lecture 4 Chapter 2 2.3 Inertia and Equilibrium: Newton s First Law of Motion 2.4 Vector Addition Using Components 2.5 Newton s Third Law 1 Net Force The net force is the vector sum of all
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 informationSTAAR Science Tutorial 25 TEK 8.6C: Newton s Laws
Name: Teacher: Pd. Date: STAAR Science Tutorial 25 TEK 8.6C: Newton s Laws TEK 8.6C: Investigate and describe applications of Newton's law of inertia, law of force and acceleration, and law of actionreaction
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 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 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 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 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 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 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 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 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 informationWorksheet #1 Free Body or Force diagrams
Worksheet #1 Free Body or Force diagrams Drawing FreeBody Diagrams Freebody diagrams are diagrams used to show the relative magnitude and direction of all forces acting upon an object in a given situation.
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 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 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 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 informationAnnouncements. Dry Friction
Announcements Dry Friction Today s Objectives Understand the characteristics of dry friction Draw a FBD including friction Solve problems involving friction Class Activities Applications Characteristics
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 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 informationObjective: Equilibrium Applications of Newton s Laws of Motion I
Type: Single Date: Objective: Equilibrium Applications of Newton s Laws of Motion I Homework: Assignment (111) Read (4.14.5, 4.8, 4.11); Do PROB # s (46, 47, 52, 58) Ch. 4 AP Physics B Mr. Mirro Equilibrium,
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 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 informationQ: Who established the law of universal gravitation? A: Newton. Q: What is a spring scale used for? A: To measure weight
Q: Who established the law of universal gravitation? A: Newton Q: What is a spring scale used for? A: To measure weight Q: What is the Law of Universal Gravitation? A: Everything in the universe has gravity.
More informationPhysical Science Chapter 2. Forces
Physical Science Chapter 2 Forces The Nature of Force By definition, a Force is a push or a pull. A Push Or A Pull Just like Velocity & Acceleration Forces have both magnitude and direction components
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 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 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 Gravity. Friction. Section 2. The Causes of Friction
Section 2 Friction and Gravity What happens when you jump on a sled on the side of a snowcovered hill? Without actually doing this, you can predict that the sled will slide down the hill. Now think about
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 informationLAWS OF FORCE AND MOTION
reflect Does anything happen without a cause? Many people would say yes, because that often seems to be our experience. A cup near the edge of a table suddenly crashes to the fl oor. An apple falls from
More informationResistance in the Mechanical System. Overview
Overview 1. What is resistance? A force that opposes motion 2. In the mechanical system, what are two common forms of resistance? friction and drag 3. What is friction? resistance that is produced when
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 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 informationQUESTIONS : CHAPTER5: LAWS OF MOTION
QUESTIONS : CHAPTER5: LAWS OF MOTION 1. What is Aristotle s fallacy? 2. State Aristotlean law of motion 3. Why uniformly moving body comes to rest? 4. What is uniform motion? 5. Who discovered Aristotlean
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 informationForce & Motion. Force & Mass. Friction
1 2 3 4 Next Force & Motion The motion of an object can be changed by an unbalanced force. The way that the movement changes depends on the strength of the force pushing or pulling and the mass of the
More informationNewton s Third Law. object 1 on object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 on object 1
Newton s Third Law! If two objects interact, the force exerted by object 1 on object 2 is equal in magnitude and opposite in direction to the force exerted by object 2 on object 1!! Note on notation: is
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 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 informationb. Velocity tells you both speed and direction of an object s movement. Velocity is the change in position divided by the change in time.
I. What is Motion? a. Motion  is when an object changes place or position. To properly describe motion, you need to use the following: 1. Start and end position? 2. Movement relative to what? 3. How far
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 information2 Newton s First Law of Motion Inertia
2 Newton s First Law of Motion Inertia Conceptual Physics Instructor Manual, 11 th Edition SOLUTIONS TO CHAPTER 2 RANKING 1. C, B, A 2. C, A, B, D 3. a. B, A, C, D b. B, A, C, D 4. a. A=B=C (no force)
More informationNotes: Mechanics. The Nature of Force, Motion & Energy
Notes: Mechanics The Nature of Force, Motion & Energy I. Force A push or pull. a) A force is needed to change an object s state of motion. b) Net force The sum (addition) of all the forces acting on an
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 informationNewton s Law of Motion
chapter 5 Newton s Law of Motion Static system 1. Hanging two identical masses Context in the textbook: Section 5.3, combination of forces, Example 4. Vertical motion without friction 2. Elevator: Decelerating
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 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 informationSpeed, acceleration, friction, inertia, force, gravity 11/13/15
Speed, acceleration, friction, inertia, force, gravity 11/13/15 Sarah starts at a positive position along the x axis. She then undergoes a negative displacement. Her final position A. is positive. B.
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 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 informationUnderstanding the motion of the Universe. Motion, Force, and Gravity
Understanding the motion of the Universe Motion, Force, and Gravity Laws of Motion Stationary objects do not begin moving on their own. In the same way, moving objects don t change their movement spontaneously.
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, 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 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 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 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 informationDISPLACEMENT AND FORCE IN TWO DIMENSIONS
DISPLACEMENT AND FORCE IN TWO DIMENSIONS Vocabulary Review Write the term that correctly completes the statement. Use each term once. coefficient of kinetic friction equilibrant static friction coefficient
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 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 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 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 informationForce and Motion Test
Force and Motion Test Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. (1 point each) 1. Your best guess of how an experiment might turn out
More informationNewton s Laws of Motion
Newton s Laws of Motion The Earth revolves around the sun in an elliptical orbit. The moon orbits the Earth in the same way. But what keeps the Earth and the moon in orbit? Why don t they just fly off
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 informationReview Vocabulary force: a push or a pull. Vocabulary Newton s third law of motion
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 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 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 informationSOLUTIONS TO PROBLEM SET 4
MASSACHUSETTS INSTITUTE OF TECHNOLOGY Department of Physics Physics 8.01X Fall Term 2002 SOLUTIONS TO PROBLEM SET 4 1 Young & Friedman 5 26 A box of bananas weighing 40.0 N rests on a horizontal surface.
More informationForces: Equilibrium Examples
Physics 101: Lecture 02 Forces: Equilibrium Examples oday s lecture will cover extbook Sections 2.12.7 Phys 101 URL: http://courses.physics.illinois.edu/phys101/ Read the course web page! Physics 101:
More informationProblems Worked Out.notebook. February 26, soh cah toa θ. Working with the triangles. Statics Answers Worked out in 3rd block
Working with the triangles slope weight = mass x gravity soh cah toa θ hypotenuse normal force adjacent FN = weight cos θ opposite force downhill F downhill = weight sin θ Statics 1217 Answers Worked
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 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 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 informationOur Dynamic Universe
North Berwick High School Department of Physics Higher Physics Unit 1 Section 3 Our Dynamic Universe Collisions and Explosions Section 3 Collisions and Explosions Note Making Make a dictionary with the
More informationNewton s Laws Force and Motion
CLIL Project Physics in English Anno scolastico 20132014 Newton s Laws Force and Motion Lecture 2 Classe 3 a A Linguistico Istituto Superiore MariniGioia  AMALFI Content of the unit: Newton s Laws DYNAMIC
More informationAP Physics Applying Forces
AP Physics Applying Forces This section of your text will be very tedious, very tedious indeed. (The Physics Kahuna is just as sorry as he can be.) It s mostly just a bunch of complicated problems and
More informationMore of Newton s Laws
More of Newton s Laws Announcements: Tutorial Assignments due tomorrow. Pages 1921, 23, 24 (not 22,25) Note Long Answer HW due this week. CAPA due on Friday. Have added together the clicker scores so
More informationSTEM Fuse GAME:IT Unit 2
STEM Fuse GAME:IT Unit 2 Key formulas for math & physics calculations used in game development Definition of velocity Velocity is similar to speed but it has direction. Let's recap what a speed is. Speed
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 informationConceptual Physics Fundamentals
Conceptual Physics Fundamentals Chapter 4: NEWTON S LAWS OF MOTION Newton s Laws of Motion I was only a scalar until you came along and gave me direction. Barbara Wolfe This lecture will help you understand:
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 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 informationGuiding Questions Activity 5. What is a force? What are Newton s laws of motion? Purpose: To define force and explore Newton s three laws of motion.
Guiding Questions Activity 5 What is a force? What are Newton s laws of motion? Purpose: To define force and explore Newton s three laws of motion. Note: Earlier we established through experimentation
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. 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 information