Essentials Unit 3 Energy

The _____ energy of an object increases with its height.

• chemical potential

• kinetic

• thermal

• gravitational potential

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An object that has kinetic energy must be

• lifted above Earth’s surface

• in motion

• at rest

• changing direction

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The law of _____ states that energy in a system can change forms but can never be created or destroyed.

• conservation of energy

• consecration of energy

• conversion of energy

• construction of energy

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The kinetic energy of an object increases as its _______ increases.

• height

• speed

• volume

• potential energy

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How much force is required to lift a rock a vertical distance of 8 m if 80 J of work were done?

• 80 J

• 80 N

• 10 J

• 10 N

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When a ball is dropped it bounces until it eventually stops. Why does this happen?

• Some of the ball’s energy is lost.

• Some of the ball’s energy is converted to other forms, such as thermal and sound.

• All of the ball’s energy is eventually converted to potential energy when the ball stops bouncing.

• All of the ball’s energy is eventually converted to kinetic energy when the ball stops bouncing.

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The diagram to the right shows four locations in a temperature field. The temperature of each location is given in degrees Celsius. Heat energy will normally flow from:

• D to A

• C to B

• B to D

• B to C

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Energy stored in food would be considered

• chemical potential

• kinetic

• thermal

• gravitational potential

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Conduction is the transfer of heat energy by _______.

• direct particle contact

• electromagnetic waves

• density differences

• movement through a vacuum

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An example of an energy conversion from kinetic to thermal energy would be

• friction

• television

• flower

• gravity

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