Energy Review

As a student walks downhill at constant speed, his gravitational potential energy

• increases and his kinetic energy increases

• increases and his kinetic energy remains the same

• decreases and his kinetic energy increases

• decreases and his kinetic energy remains the same

Which graph best represents the relationship between the potential energy stored in a spring and the change in the spring’s length from its equilibrium position?

• 1

• 2

• 3

• 4

In the diagram below, an ideal pendulum released from position A swings freely to position B. As the pendulum swings from A to B, its total mechanical energy

• decreases, then increases

• increases, only

• increases, then decreases

• remains the same

If the speed of a moving object is doubled, the kinetic energy of the object is

• halved

• doubled

• unchanged

• quadrupled

A car uses its brakes to stop on a level road. During this process, there must be a conversion of kinetic energy into

• light energy

• nuclear energy

• gravitational potential energy

• internal energy

When 150 joules of work is done on a system by an external force of 15 newtons in 20. seconds, the total energy of that system increases by

• 150J

• 200J

• 300J

• 2300 J

A shopping cart slows as it moves along a level floor. Which statement describes the energies of the cart?

• The kinetic energy increases and internal energy decreases.

• The kinetic energy increases and the internal energy increases.

• The kinetic energy decreases and the internal energy decreases.

• The kinetic energy decreases and the internal energy increases.

A ball is dropped from the top of a cliff. Which graph best represents the relationship between the ball’s total energy and elapsed time as the ball falls to the ground?

• 1

• 2

• 3

• 4

As the time required to do a given quantity of decreases, the power developed

• decreases

• increases

• remains the same

A block slides across a rough, horizontal tabletop. As the block comes to rest, there is an increase in the block-tabletop system’s

• gravitational potential energy

• elastic potential energy

• kinetic energy

• internal (thermal) energy