Unit 5 Review - Mechanical Energy (PE and KE)

Nena is rolling down a steep hill. When is her kinetic energy most likely the highest?

• at the bottom of the hill just before she stops moving

• at the bottom of the hill once she has stopped moving

• at the very top of the hill before she has started rolling down the hill

• right after the top of the hill just as she starts rolling down the hill

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The table shows the speed and height over time of a ball that starts at rest, then is dropped from the top of a building, which is 60 meters (m) tall. After how many seconds is the ball's kinetic energy at its maximum?

• 0.5 second

• 1.0 second

• 1.5 seconds

• 2.0 seconds

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Which of the following is indicated by the speed of an object?

• direction of the object

• energy of the object

• phase of the object

• volume of the object

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Which word best describes the energy of an object in motion?

• potential

• kinetic

• mechanical

• thermal

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The potential energy of an object is

• dependent on its shape.

• dependent on its volume.

• dependent on its position.

• dependent on temperature.

The kinetic and potential energies of an object both always depend on which property?

• mass of the object

• volume of the object

• relative position of the object

• gravitational force on the object

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Which situation describes a system with decreasing gravitational potential energy?

• a bicyclist riding up a steep hill

• a boy jumping down from a tree limb

• a rocket rising vertically from Earth

• a girl stretching a horizontal spring

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A student throws a ball in the air. The path that the ball travels is shown. At which two points is the kinetic energy of the ball at its maximum?

• Point 1 and 2

• Point 2 and 4

• Point 3 and 4

• Point 1 and 5

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What is true about the ball at Point 3?

• The ball has minimum potential energy and maximum kinetic energy.

• The ball has maximum potential energy and minimum kinetic energy.

• The ball has increasing potential energy and decreasing kinetic energy.

• The ball has decreasing potential energy and increasing kinetic energy.

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A student is conducting an investigation using rubber bands. She places a rubber band

around her thumb and index finger, pulls back, releases the rubber band, and records

how far the band travels. She repeats this process while varying the distance in the

pullback between her thumb and finger. What is the student MOST LIKELY studying?

• the effect of gravity on unbalanced forces

• the effect of mass on the speed of a falling object

• the transformation between potential and kinetic energy

• the transformation between mechanical and chemical energy

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