8.2 Physics Review

An object that has kinetic energy must be

• in motion

• stopped

• at an elevated position

• at rest

Which best explains the relationship between the speed and energy of an object?

• As an object's speed increases, its energy increases.

• As an object's speed decreases, its energy increases.

• As an object's speed increases, its energy remains constant.

• As an object's speed increases, its energy decreases.

Cars A, B, C, and D are traveling at different speeds in four different lanes on the highway. Evaluate the data and select the list ordering cars with the MOST energy to the LEAST energy?

• B, D, C, A

• A, C, D, B

• C, D, A, B

• A, D, C, B

A box slides from the top of a ramp to the bottom, its maximum potential energy is located

• at the top

• equal at all locations

• at the bottom

• at the exact middle of the ramp

A pole vaulter runs forward, plants his pole, rises in the air and lands. What point represents his greatest amount of gravitational potential energy?

• just before he starts to fall to the ground

• ater take-off as the pole expands and lifts the vaulter toward the bar

• when he initially lands

• as he runs forward to plant the pole

Point B represents a distance half-way down the ramp. If the ball rolls down the ramp, how much potential energy has been converted to kinetic energy at point B?

• 50 J

• 0 J

• 25 J

• 100 J

You can use a small marble with a mass of 15g or a large marble with a mass of 20g on an energy lab track. What should you do to give your marble the most potential energy?

• They should use a large marble with the ramp at a 75° angle.

• They should use a small marble with the ramp at a 60° angle.

• They should use a small marble with the ramp at a 45° angle.

• They should use a large marble with the ramp at a 60° angle.

At what point in the swing of the pendulum is the potential energy completely converted into kinetic energy?

• B

• A

• C

• D

The rock in the picture is pushed over the edge and it begins to fall. Which type of energy conversion is taking place?

• potential to kinetic

• sound to mechanical

• kinetic to potential

• mechanical to heat

As time passes, which of these is decreasing?

• Amplitude

• Crest

• Wavelength

• Trough