Download Name: ___________ Date: ______ Hour: ______ What do Newton

Chapter 2 Section 2
Newton’s Laws of Motion
Pages 44-51
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Name: _________________
Date: _______
Hour: _______
What do Newton’s three laws of motion explain? ____________________________________
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What does Newton’s first law of motion state? _____________________________________
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Newton’s first law of motion describes the motion of an object that has a net force of
___________ acting on it.
If you push a ball down a hill, and no one stops it, why does it eventually stop? ______________
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What does friction do to the motion of objects? ____________________________________
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Describe inertia. ____________________________________________________________
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How are mass and inertia related? _______________________________________________
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State Newton’s second law of motion. ____________________________________________
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What are the two factors that determine acceleration? _______________________________
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How are mass of an object and the acceleration of the object related? ___________________
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Describe the relationship between the force on an object and the acceleration of the object.
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Which of the following will increase the acceleration of an object that is pushed by a force?
a. decreasing the mass of the object
b. increasing the mass of the object
c. increasing the force pushing the object
d. Both (a) and (c)
What is the formula for acceleration? Write your answer in both words and as a mathematical
formula. __________________________________________________________________
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What is the formula for force? Write your answer in both words and as a mathematical formula.
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15. What is the acceleration of a 7 kg mass if a force of 68.6 N is used to move it toward Earth?
(Remember 1 N = 1 kg  m/s²) SHOW YOUR WORK. See the Math Focus Box on p. 48 for
help. ____________________________________________________________________
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16. What force is necessary to accelerate a 1,250 kg car at a rate of 40 m/s²? (Remember
1 N = 1 kg  m/s²) SHOW YOUR WORK. ________________________________________
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17. Zookeepers carry a stretcher that holds a sleeping lion. The total mass of the lion and the
stretcher is 175 kg. The lion’s forward acceleration is 2 m/s². What is the force necessary to
produce this acceleration? (Remember 1 N = 1 kg  m/s²) SHOW YOUR WORK. __________
_________________________________________________________________________
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18. What force is necessary to accelerate a 70 kg object at a rate of 4.2 m/s²? (Remember 1 N = 1
kg  m/s²) SHOW YOUR WORK. _____________________________________________
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19. State Newton’s third law of motion. _____________________________________________
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20. All forces act in ____________________.
21. How are the forces in each force pair related? _____________________________________
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22. What action and reaction forces are present when you are sitting on a chair? _______________
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23. How do action and reaction forces move a swimmer forward in the water? _________________
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24. Since all forces act in pairs, what happens when a force is exerted? ______________________
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25. When a ball falls to Earth, why is it hard to see the effect of the reaction force exerted by the
ball on Earth? ______________________________________________________________
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26. When a soccer ball is kicked, the action and reaction forces do not cancel each other out because
a. the forces are not equal in size.
b. the forces act on different objects.
c. the forces act at different times.
d. All of the above.
27. Why do objects fall toward Earth? ______________________________________________
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28. Suppose you are standing on a skateboard or on in-line skates and you toss a backpack full of
heavy books toward your friend. What do you think will happen to you? Explain your answer in
terms of Newton’s third law of motion. ___________________________________________
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