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Practice Test Answers

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1
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Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 75kg dining table
B
a 5kg dining chair
C
a 50kg couch
D
an 10kg end table
2
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Which best describes a force?

A
a vector with speed and strength
B
a vector with strength only
C
a vector with direction only
D
a vector with magnitude and direction
3

Which is an example of the strong force in action?

A
A battery-powered radio produces sound.
B
The protons in the nucleus of a carbon atom are held together.
C
A magnet keeps a cabinet door closed.
D
The Sun pulls on Earth as Earth moves around the Sun.
4

Which best describes friction?

A
a downward pull when objects fall through the air
B
a downward pull on objects that roll on bumpy surfaces
C
a constant force that pulls two objects toward each other
D
a constant force that acts on objects that rub together
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

Riley is doing an experiment working with friction. He wants to find two ways to modify an object that could increase or decrease the same type of friction. Which methods could he use to perform his experiment?

A
increasing roughness and speed
B
using nonstick materials and ball bearings
C
increasing surface area and aerodynamic design
D
using lubricants and increasing surface area
7

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
increasing the action force
D
decreasing the mass of the car
8

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 greater than it was before the collision.
B
It is often the same as it was before the collision.
C
It is always the same as it was before the collision.
D
It is often greater than it was before the collision.
9

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

A
The object falls faster and faster until it strikes the ground.
B
The object speeds up and then stops when air resistance equals gravity.
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.
10

A tugboat is pulling a barge into a harbor. The barge is exerting a force of 3000 N against the tugboat. Which force would most likely allow the tugboat to move the barge into the harbor?

A
4500 N in the opposite direction of the barge
B
3000 N in the same direction of the barge
C
3000 N in the opposite direction of the barge
D
4500 N in the same direction of the barge
11

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, and the hammer and feather hit at the same time on the moon.
B
The hammer hits the ground before the feather on both Earth and the moon.
C
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
D
The hammer and the feather hit the ground together on both Earth and the moon.
12

A relationship exists between gravity, mass, and distance. The greater the mass of the objects, the greater the gravitational force between them. The greater the distance between the objects, the weaker the gravitational force between them. Which of these objects would have the greatest gravitational force between them?

A
two objects, each with a mass of 20 kg, separated by a distance of 10 m
B
two objects, each with a mass of 10 kg, separated by a distance of 10 m
C
two objects, each with a mass of 10 kg, separated by a distance of 15 m
D
two objects, each with a mass of 20 kg, separated by a distance of 15 m

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