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Chapter Resources
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glencoe.com
Image Bank
Foldables
Chapter Summary
Chapter Review Questions
Standardized Test Practice

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3. Image Bank
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4. Image Bank
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5. Image Bank
Balanced Forces

6. Image Bank
Unbalanced Forces

7. Image Bank
Flowers on Table

8. Image Bank
Traffic Light

9. Image Bank
Sliding Friction

10. Image Bank
Rolling Friction

11. Image Bank
Rolling Friction

12. Image Bank
Gravity

13. Weight on Different Planets
Image Bank
Weight on Different Planets

14. Image Bank
Force Exerted

15. Action-Reaction Force Pairs
Image Bank
Action-Reaction Force Pairs

16. Image Bank
Merry-go-round

17. Image Bank
Ball Relative to Earth

18. Action-Reaction Force Pairs
Image Bank
Action-Reaction Force Pairs

19. Image Bank
Walking

20. Image Bank
Rocket Engine

21. Image Bank
Weight

22. Image Bank
Weightlessness

23. Foldables
Newton’s Laws
Make the following Foldable to help you organize your thoughts about Newton’s laws.

24. Foldables
Fold a sheet of paper in half lengthwise. Make the back edge about 5 cm longer than the front edge.

25. Turn the paper so the fold is on the bottom. Then fold it into thirds.
Foldables
Turn the paper so the fold is on the bottom. Then fold it into thirds.

26. Unfold and cut only the top layer along both folds to make three tabs.
Foldables
Unfold and cut only the top layer along both folds to make three tabs.

27. Label the foldable as shown.
Foldables
Label the foldable as shown.

28. Foldables
Make a Concept Map
As you read the chapter, record what you learn about each of Newton’s laws in your concept map.

29. Newton’s First Law 1 A force is a push or a pull.
Reviewing Main Ideas 1
Newton’s First Law
A force is a push or a pull.
Newton’s first law states that objects in motion tend to stay in motion and objects at rest tend to stay at rest unless acted upon by a net force.
Friction is a force that resists motion between surfaces that are touching each other.

30. Reviewing Main Ideas 2
Newton’s Second Law
Newton’s second law states that an object acted upon by a net force will accelerate in the direction of this force.
The acceleration due to a net force is given by the equation a = Fnet/m.

31. Reviewing Main Ideas 2
Newton’s Second Law
The force of gravity between two objects depends on their masses and the distance between them.
In circular motion, a force pointing toward the center of the circle acts on an object.

32. Reviewing Main Ideas 3
Newton’s Third Law
According to Newton’s third law, the forces two objects exert on each other are always equal but in opposite directions.
Action and reaction forces don’t cancel because they act on different objects.
Objects in orbit appear to be weightless because they are in free fall around Earth.

33. Chapter Review
Question 1
Which of Newton’s laws explains how this rocket gets off the ground?
PS 5.1e

34. Chapter Review
Answer
Newton’s third law explains how a rocket moves upward. The force of the propellant being driven out the base of the rocket causes an equal but opposite force pointing in the other direction, which drives the rocket up.

35. Chapter Review
Question 2
When the air resistance force equals a falling object’s weight, the net force on the falling object is zero. The object has reached _______.
PS 5.2

36. Chapter Review
Answer
The answer is terminal velocity. This means its acceleration is zero; it does not mean that the falling object stops moving.

37. Chapter Review
Question 3
If you are going around in circles, even at an unchanging speed, you are constantly _______.
A. accelerating
B. increasing in velocity
C. increasing your distance
D. slowing down
PS 5.1d

38. Chapter Review
Answer
The answer is A. This is called circular motion.

39. Chapter Review
Question 4
When you throw a ball, why doesn’t it move in a straight line?
Answer
It would, if you were in space. On Earth, however, the force of gravity causes it to move in a curve as it falls.
PS 5.2

40. Chapter Review
Question 5
What is responsible for slowing down the lunch trays in this illustration?
A. acceleration
B. friction
C. gravity
D. inertia
PS 5.2d

41. Chapter Review
Answer
The answer is B. Friction always opposes sliding between two objects.

42. Standardized Test Practice
Question 1
Which would remain unchanged were you to go up in the space shuttle?
A. your distance from the Earth
B. your mass
C. your perceptions
D. your weight
PS 5.1d

43. Standardized Test Practice
Answer
The answer is B. Your weight is relative to your distance from Earth and whether or not you are in freefall.

44. Standardized Test Practice
Question 2
You are swimming laps in a pool. When you come to the end, you turn around underwater and push off the wall. What does the wall do?
A. it changes state
B. it does nothing
C. it pushes back
D. it pulls on you
PS 5.1e

45. Standardized Test Practice
Answer
The answer is C. Newton’s third law states that the wall pushes back on you with the same amount of force you exert on it.

46. Standardized Test Practice
Question 3
Suppose you are in a space station when suddenly you realize an asteroid is headed your way. What do you need to know about the asteroid to know how forceful the impact will be?
PS 5.1d

47. C. its mass and its acceleration
Standardized Test Practice
A. its mass
B. its acceleration
C. its mass and its acceleration
D. its mass and its acceleration and its origin
PS 5.1d

48. Standardized Test Practice
Answer
The correct answer is C. Newton showed that f =ma. If the asteroid is moving very slowly, or if it has very little mass, the force of its impact will be much less than if it is very massive and moving quickly.

49. Standardized Test Practice
Question 4
Which object would have the least acceleration if you pushed on it with a force of 5 N?
Object
Mass (g)
Cup
380
Book
1,100
Can
240
Ruler 25
Stapler
620
A. book
B. can
C. cup
D. stapler
PS 5.1d

50. Standardized Test Practice
Answer
The answer is A. Acceleration is calculated using the equation a = Fnet/m.

51. Standardized Test Practice
Question 5
The type of friction that prevents an object from starting to move is known as _______.
A. static electrical friction
B. static friction
C. typical friction
D. total friction
PS 5.2d

52. Standardized Test Practice
Answer
The answer is B. Static friction is different from sliding friction, which slows down an object that is sliding.

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