Chapter 7: Energy TEST

No work is done by gravity on a bowling ball that rolls along a bowling alley because

• little distance is covered by the ball.

• no force acts on the ball.

• the ball's speed remains constant.

• the force on the ball is at right angles to the ball's motion.

An object has gravitational potential energy (GPE) due to its

• acceleration.

• location.

• momentum.

• speed.

Relative to an initial height, an object raised twice as high has a gravitational potential energy

• half as much.

• twice as much.

• four times as much.

• need more information.

When a drawn bow with a potential energy value of 40-J is fired the arrow will ideally have a kinetic energy value of

• less than 40-J

• more than 40-J

• 40-J

• need more information.

An object that has kinetic energy must be

• at an elevated position.

• at rest.

• falling.

• moving.

A feather and a coin dropped in a vacuum fall with equal forces due to gravity.

• FALSE

• TRUE

When C.J. brakes his speeding bicycle to a stop, kinetic energy is transferred to

• energy of motion.

• energy of rest.

• heat.

• potential energy.

A circus diver drops from a high pole into water far below. When he is halfway down

• his potential energy is halved.

• his kinetic energy and potential energy are equal.

• his kinetic energy his halved.

• both A and B

• none of the above

A common pulley acts similar to a common lever.

• FALSE

• TRUE

Earth's primary energy source is

• the Sun.

• fossil fuels.

• electricity.

• geothermal energy.