Energy Answers

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A cyclist eats a full meal before going to ride a bike for 2 hours. Which energy transformation happens during this process?

A
Chemical energy turns into mechanical energy.
B
Kinetic energy turns into potential energy.
C
Thermal energy turns into electromagnetic energy.
D
Potential energy turns into chemical energy.
3

Thermal energy is the energy associated with

A
electric fields.
B
being stored in chemical bonds.
C
the pull of gravity.
D
temperature.
6

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
7

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.
9

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.

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