Conservation of Energy AP Physics

Which of the following is an example of a transformation of potential energy to kinetic energy?

• a truck slowing down

• a car climbing up a hill

• an airplane traveling at constant speed

• falling object

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A 40 kg crate is picked up by a crane to a height of 50m. The crate falls. What is the velocity of the crate just before it hits the ground?

• 2000 Joules

• 19,600 Joules

• 19,600 m/s

• 31.3 m/s

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A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?

• 0.26 m

• 0.52 m

• 5.2 m

• 25 m

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What type of energy is in this picture?

• Kinetic

• Potential

• Chemical

• Sound

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What force ultimately slows the roller coaster to a stop?

• Applied

• Normal

• Friction

• Magnetic

Elastic potential energy is energy stored in an object, such as a spring, due to the object being stretched or compressed. In which position is it most likely that the spring has lost its elastic potential energy?

• W

• Y

• X

• Z

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The ability to do work is called

• energy

• thermal

• kinetic

• potential

When a 65 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances the force due to free fall.  How fast is the skydiver falling if her kinetic energy at the moment is 704000J?

• 21661.53 m/s

• 147.17 m/s

• 22880.0 km/s

• 10830.76 m/s

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What is mechanical energy?

• It is what metal creates when heated.

• All potential and kinetic energy in a system.

• It is motion of all matter.

• Energy of momentum.

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Which of the following scenarios best illustrates the conservation of mechanical energy?

• A pendulum swinging in a vacuum

• A car accelerating on a highway

• A ball rolling down a hill with friction

• A rocket launching into space

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