Cumulative Exam — Cumulative exam Answers

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The force of gravity causes all objects near Earth's surface to fall with an acceleration of 20 m/s2.

A
T
B
F
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Niagara Falls is a good example of

A
kinetic energy being converted into potential energy.
B
potential energy being converted into kinetic energy.
C
energy being lost.
D
energy being created.
43

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
44

Objects falling through air experience a type of friction called

A
terminal velocity.
B
air resistance.
C
inertia.
D
rolling friction.
46

All objects emit ____ radiation.

A
electromagnetic
B
kinetic
C
thermal
D
solar
47

Compared to water, most metals have low specific heats.

A
T
B
F
48

______ states that energy cannot be created or destroyed.

A
Newton’s second law
B
Newton’s third law
C
The law of conservation of energy
D
Boyle’s law
49

Why does a car move forward while traveling on a road, even though its wheels are equipped to spin backwards?

A
The force of the road is greater than the force of the tires
B
The reaction force of the road pushes the wheels forward
C
The force of the tires overcomes the force of the road
D
The wheels only appear to spin backwards
50

A net force of 100 N is moving a mass with an acceleration of 5 m/s2. What is the mass of the object?

A
0.05 kg
B
20 kg
C
95 kg
D
500 kg

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