Energy Answers

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1
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Which is the best example of potential energy?

A
holding a basketball in the air
B
rolling a ball across a flat table
C
flowing electric current through a wire
D
turning on a flashlight in a dark room
2
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An arrow is fired at a target on a high wall. How does the energy change between the moment the arrow is fired and the moment it hits the target?

A
The potential energy and kinetic energy remain the same.
B
The potential energy decreases as kinetic energy increases.
C
The kinetic energy decreases as potential energy increases.
D
The kinetic energy remains at zero, but potential energy increases.
4

Which scenario would adhere to the law of conservation of energy?

A
Energy is created when water freezes.
B
Energy is destroyed when sugar is burned.
C
Energy stays inside molecules permanently.
D
Energy is transferred when atoms are rearranged.
5

A generator contains a coil that spins to produce an electric current. How is energy transformed by using a generator?

A
Thermal energy is transformed to potential energy.
B
Thermal energy is transformed to mechanical energy.
C
Chemical energy is transformed to electromagnetic energy.
D
Mechanical energy is transformed to electromagnetic energy.
6

What happens to energy when Sally kicks a soccer ball?

A
Kinetic energy is transformed to chemical energy in muscles.
B
Potential energy is transformed to chemical energy in muscles.
C
Kinetic energy is transferred from the leg to the soccer ball.
D
Potential energy is transferred from the leg to the soccer ball.
7

Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb?

A
chemical energy to electromagnetic energy and thermal energy
B
electromagnetic energy to chemical energy and thermal energy
C
chemical energy to electromagnetic energy
D
thermal energy to chemical energy
8

Which statement describes thermal energy?

A
the energy that is associated with electric fields
B
the energy that is stored in chemical bonds
C
the energy that is associated with the pull of gravity
D
the energy that is associated with temperature
10

What type of energy is the sum of an object’s potential and kinetic energy?

A
mechanical energy
B
electromagnetic energy
C
chemical energy
D
thermal energy

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