Download Chapter 6 Study Guide: Newton`s 3rd Law of Motion – Action

Name: ________________________________________ Block: _____ Date: _____/_____/_____
Conceptual Physics
Chapter 6 Study Guide: Newton's 3rd Law of Motion – Action & Reaction
Multiple Choice
Identify the choice that best completes the statement or answers the question. Write the letter of your response on the line
provided.
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1. An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to
this force is the _____.
a. arrow’s push against the bowstring
c. air resistance against the bow
b. weight of the arrow
d. grip of the archers hand on the bow
2. A high school student hits a nail with a hammer. During the collision, there is a force _____.
a. on the nail but not on the hammer
b. on the nail and also on the hammer
c. on the hammer but not on the nail
3. A rocket is able to accelerate in the vacuum of space when it fires its engines. The force that propels the
rocket is the force _____.
a. of the rocket on the exhaust gases
b. of the exhaust gases on the rocket
c. none of the above
4. Forces always occur ______.
a. as single quantities
c. in pairs
b. by themselves
d. in triplets
5. According to Newton’s third law, if you push gently on something, it will push _____.
a. gently on something else
c. gently on you
b. on you only if you are not moving
d. all of the above
6. A force is exerted on the tires of a car to accelerate the car along the road. The force is exerted by the _____.
a. road
c. tires
b. engine
d. air
7. A woman weighing 450 N sits on the floor. She exerts a force of _____ on the floor.
a. 4.5 N
c. 450 N
b. 45 N
d. 4500 N
8. Nellie Newton holds an apple in her hand. If action is Earth pulling on the apple, then reaction is _____.
a. her hand providing a normal force on the apple
b. her hand pushing up on the apple
c. both (a) and (b)
d. neither (a) nor (b)
9. As a ball falls, the action force is the pull of Earth’s mass on the ball. What is the reaction to this force?
a. The pull of the ball’s mass on Earth.
c. Nonexistent in this case.
b. The acceleration of the ball.
d. Air resistance acting on the ball.
10. A person is attracted towards the center of Earth by a 440 N gravitational force. The force with which Earth
is attracted toward the person is _____.
a. less than 440 N
c. more than 440 N
b. 440 N
d. the weight of Earth
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Name: ________________________________________ Block: _____ Date: _____/_____/_____
Conceptual Physics
____ 11. An unfortunate bug splatters against the windshield of a moving car. Compared to the deceleration of the car,
the deceleration of the bug is _____.
a. larger
b. the same
c. smaller
____ 12. Your friend says that the heavyweight champion of the world cannot exert a force of 95 N on piece of tissue
paper with his best punch. The tissue paper is held in midair; no wall and no tricks.
a. You agree that it can’t be done.
b. You disagree because a good punch easily delivers this much force.
c. You have reservations about this claim
____ 13. Earth pulls on the moon and similarly, the moon pulls on Earth. This is evidence that the _____
a. Earth and moon are simply pulling in each other
b. Earth and moon’s pull comprise an action-reaction pair
c. both (a) and (b)
d. neither (a) nor (b)
____ 14. A karate chop delivers a blow of 2300 N to a board that breaks. The force that acts on the hand during this
feat is _____.
a. less than 2300 N
c. 2300 N
b. more than 2300 N
d. cannot be determined
____ 15. A woman weighing 520 N stands on the floor. The floor exerts a force of _____ on the woman.
a. 5.2 N
c. 520 N
b. 52 N
d. 5200 N
____ 16. A large truck and a small car traveling at the same speed have a head-on collision. Which vehicle will
undergo the greater change in velocity?
a. the small car
b. neither
c. the large truck
____ 17. An unfortunate bug splatters against the windshield of a moving car. Compared to the force of the car on the
bug, the force of the bug on the car is _____.
a. larger
b. the same
c. smaller
____ 18. Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude,
but in the opposite direction to that of the first object.
a. Sometimes true.
b. Always true.
c. Always false.
____ 19. A player hits a ball with a bat. The action force is the impact of the bat against the ball. What is the reaction
to this force?
a. The force of the ball against the bat.
b. The weight of the ball.
c. Air resistance on the ball.
d. The grip of the player’s hand against the bat.
____ 20. A player catches a ball. Consider the action force to be the impact of the ball against the player’s glove.
What is the reaction to this force?
a. The force the glove exerts on the ball.
b. Friction of the ground against the player’s shoes.
c. The player’s grip on the glove.
d. none of the above
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Name: ________________________________________ Block: _____ Date: _____/_____/_____
Conceptual Physics
____ 21. If a horse pulls on a wagon at rest, the wagon pulls back equally on the horse. Can the wagon be set into
motion?
a. Yes, because there is a net force acting on the wagon.
b. Yes, because there is a time delay between action and reaction.
c. No, because the forces cancel each other.
d. none of the above
____ 22. Bronco the skydiver falls toward Earth. The attraction of Earth on Bronco pulls him down. The reaction to
this force is _____.
a. Bronco pushing against the Earth’s surface
b. Bronco pulling up on Earth
c. Earth’s surface pushing against Bronco
d. none of the above
Numeric Response
Respond to each of the following problems in the space provided. Make sure your numerical responses include both a
number and a unit.
23. Two blocks of different masses experience the same force. The smaller block has one-third the mass of the
larger block. How many times faster does the smaller block accelerate?
.
24. If you push off the ground with a force of 425 N when you jump upward, what force pushes Earth downward?
.
25. The maximum thrust force that can be created using a toy rocket kit is 49 N. Calculate the maximum mass
possible for a successful launch.
.
26. If you stomp on the ground with a force of 175 N downward, with what force does Earth push upward?
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Name: ________________________________________ Block: _____ Date: _____/_____/_____
Conceptual Physics
27. Two blocks of different masses experience the same force. The larger block has quadruple the mass of the
smaller block. How many times faster does the smaller block accelerate?
.
28. What thrust force is required to successfully launch a 45 kg rocket?
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