Answers26-27 RPA - US History 1 CRPrescriptive Test

Newton's Third Law Answers

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A boy is pushing forward on a crate with a force of 100 newtons. The reaction force is

A
the crate pushing back on the boy with a force of 100 newtons.
B
the crate moving forward at a constant rate.
C
the crate remaining at rest with a weight of 100 newtons.
D
the crate accelerating 10 m/s2 forward.
2
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Action-reaction forces always act on the same objects.

A
T
B
F
3

Forces always act alone.

A
T
B
F
4

When a flying bug hits a moving train, no effect is observed on the train because___________.

A
the train is moving
B
the force is perpendicular to the motion of the train
C
the force is balanced
D
The train is much more massive than the bug
5

According to Newton’s third law of motion, a reaction force between two objects is

A
equal to
B
greater than
C
less than
6

Newton’s third law of motion states that every action has an __________ but __________ reaction.

A
equal, identical
B
opposite, real
C
equal, opposite
D
identical, frictional
7

A rocket launching is an example of Newton's ______ law.

A
first
B
second
C
third
D
fourth
8

Objects in free fall are weightless.

A
T
B
F
9

When a ball bounces off a wall, the net force on the ball is zero because of action and reaction forces.

A
T
B
F
10

The statement "for every action, there is an equal but opposite reaction" is a statement of ____.

A
the law of conservation of momentum
B
Newton's first law
C
Newton's second law
D
Newton's third law
11

If the action force is a player kicking a soccer ball, then what is the reaction force?

A
the ball accelerating in the direction of the kick
B
the ball moving at a constant speed in the direction of the kick
C
the ball accelerating in the opposite direction of the kick
D
the ball pushing on the player in the opposite direction of the kick
12

Astronauts in orbit are not truly weightless.

A
T
B
F
13

Rockets are able to accelerate in space because:

A
they have excess fuel to burn from their initial take-off
B
they push exhaust in the same direction as they wish to accelerate
C
the force of gravity propels them
D
they push exhaust in a direction opposite to the direction that they wish to accelerate
14

What is the reactive force when a fish swims through water?

A
The force of the fish's tail on the water
B
The force of air resistance on the fish
C
The force of gravity on the fish
D
The force of the water on the fish
15

When you push downward on Earth to make a pole vault, Earth exerts an equal force on the pole.

A
T
B
F
16

What allows us to stand upright and keeps us from falling through the ground?

A
While gravitational force pulls us down, the opposing force from the ground pushes up and balances out the two forces
B
The force of gravity is stronger than the force of the ground pushing up on us
C
While gravitational force pulls us down, the ground is pulling us down too
D
The force of the ground pushing up on us is stronger than the force of gravity

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