Physics Energy, Work, & Power Practice

Two equal mass marbles are at the top of a ramp. Marble A falls to the ground off the back while marble B rolls down the ramp. Compared to marble A at the bottom marble B at the bottom has ___potential energy, ___kinetic energy, and ____speed.

• The marble that rolled down the ramp is moving faster than the marble that fell.

• The marble that fell down the back of the ramp is moving faster than the marble that rolled.

• The marble that rolled down the ramp is not moving when it reaches the ground.

• The two marbles are moving with the same speed.

Potential energy is associated with ---.

• speed

• position

• direction

• temperature

Kinetic energy is associated with ---.

• speed

• position

• direction

• temperature

 

A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

• The block did not go as high on the other side because gravity pulls down.

• The block did not go as high on the other side because potential energy always has to decrease.

• The situation as described is impossible to happen.

• The block did not go as high on the other side because work from friction made the mechanical energy less.

If there is no friction on this track, at which point would the coaster have the most kinetic energy?

• A

• B

• C

• D

The roller coaster will gain potential energy from points__

• A to B

• B to C

• C to D

• The roller coaster is always losing potential energy

When external forces like an applied force, friction force, or drag force act on a system of objects they __

• have no effect on a system's mechanical energy.

• convert kinetic energy into potential energy.

• convert potential energy into kinetic energy.

• convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.

When energy is conserved, something that is falling will experience a ____ in/of kinetic energy and a______ in/of gravitational energy _____ and its kinetic energy ____

• loss; gain

• loss; loss

• gain; gain

• gain; loss

A car starts from rest and accelerates to a velocity of 5 m/s. As the car rolls along a horizontal road, its gravitational energy __ and its kinetic energy ___

• remains the same; increases

• increases; increases

• remains the same; decreases

• increases; decreases

When work is done by friction the total mechanical energy ___ and kinetic energy coverts into ___ energy

• remains the same; gravitational

• decreases; gravitational

• remains the same; thermal

• decreases; thermal