Energy Answers

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1
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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.
2
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When an object falls toward the ground due to gravity, what type of energy becomes kinetic energy?

A
chemical
B
electromagnetic
C
potential
D
thermal
3

Which is the best term to use when describing the energy of position?

A
chemical
B
kinetic
C
potential
D
electromagnetic
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
8

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.
9

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.
10

Thermal energy is the energy associated with

A
electric fields.
B
being stored in chemical bonds.
C
the pull of gravity.
D
temperature.
11

According to the law of conservation of energy, what will most likely happen in a closed system?

A
Energy will be exchanged along with matter.
B
Energy will be exchanged, but matter will not be exchanged.
C
Energy will be created along with matter.
D
Energy will be destroyed, but matter will not be destroyed.
12

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
14

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.
15

Which is the best term to use when describing the energy of motion?

A
chemical
B
kinetic
C
potential
D
thermal
16

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.

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