AnswersPhysical ScienceForces and Newton's Laws of Motion

Practice Test Answers

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1
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Two objects collide and bounce apart. Assuming no outside forces act on the system, which best describes the total momentum after the collision?

A
It is always the same as it was before the collision.
B
It is often greater than it was before the collision.
C
It is always greater than it was before the collision.
D
It is often the same as it was before the collision.
2
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A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather. Which result is expected?

A
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
B
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.
C
The hammer hits the ground before the feather on both Earth and the moon.
D
The hammer and the feather hit the ground together on both Earth and the moon.
3

Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 50kg couch
B
an 10kg end table
C
a 5kg dining chair
D
a 75kg dining table
4

Which best describes a force?

A
a vector with speed and strength
B
a vector with strength only
C
a vector with magnitude and direction
D
a vector with direction only
5

A football player has a mass of 65 kilograms and is moving with a velocity of 5 meters per second What is the player’s momentum?

A
325 kilograms times m over s
B
305 kilograms times m over s
C
13 kilograms times m over s
D
70 kilograms times m over s
6

Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

A
increasing the inertia of the car
B
decreasing the reaction force
C
decreasing the mass of the car
D
increasing the action force
7

Which describes an object’s speed when free falling in a vacuum?

A
The object speeds up and then stops when air resistance equals gravity.
B
The object falls faster and faster until it strikes the ground.
C
The object falls at a constant speed because only one force acts on it.
D
The object accelerates until it reaches its terminal velocity.

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