Energy

The ____ energy of an object increases with its height.

• chemical potential

• kinetic

• thermal

• gravitational potential

An object that has kinetic energy must be

• lifted above Earth's surface

• in motion

• at rest

• changing direction

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

• conservation of energy

• consecration of energy

• conversion of energy

• construction of energy

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

• height

• speed

• volume

• potential energy

How much force is required to lift a rock a vertical distance of 9 m is 90 J of work were done?

• 90 J

• 90 N

• 10 J

• 10 N

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.

Energy stored in food would be considered

• chemical potential

• kinetic

• thermal

• gravitational potential

Conduction is the transfer of heat energy by ____

• direct particle contact

• electromagnetic waves

• density differences

• movement through a vacuum

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

• friction

• television

• flower

• gravity

Green plants convert light energy from the sun into ____ during photosynthesis.

• gravitational potential energy

• chemical potential energy

• thermal energy

• mechanical energy