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## Kinetic/Potential Energy

Instructions: Read each question carefully. Choose the answer that best fits the question. Short answer response questions must be responded to in complete sentences. If the question involves calculations, you must show all your math work.

1.
What three things does gravitational potential energy depend on?

2.
Mechanical energy is
1. found in machinery, only.
2. usually measured at the atomic level.
3. the sum of the chemical and thermal energy of an object.
4. the sum of the kinetic and potential energy of an object.
3.
An example of the conversion of gravitational potential energy into kinetic energy is
1. a falling raindrop.
2. a gasoline powered engine.
3. striking a match.
4. a hockey puck sliding on ice.
4.
When a seagull picks an oyster up into the sky and then lets it drop on the rocks below to open the shell; where is the oyster's potential energy greatest? Where is its kinetic energy greatest?

5.
Kinetic energy differs from potential energy in that
1. kinetic energy is stored energy that has the capacity to do work, and potential energy is the energy of motion.
2. kinetic energy is energy that an object possesses as a result of its location, and potential is the same as heat energy.
3. kinetic energy can be converted into various forms of energy, whereas potential energy can only be transformed into heat energy.
4. kinetic energy is energy of a moving object, whereas potential energy is energy possessed by matter as a result of its location or structure.
5. kinetic energy can be created or destroyed, while potential energy can be created and destroyed.
6.
Imagine an object held at some height above the ground. It is released and falls toward the ground. Ignoring air resistance or friction, which of the following must be true?
1. Before it falls, all of its energy must be potential energy.
2. At the end of its fall, all of its energy must be converted to kinetic energy.
3. During its fall, the combination of its kinetic and potential energy must equal the amount of potential energy with which it started.
4. All of the above are true?
7.
At what point in a waterfall, do the drops of water contain the most gravitational potential energy?
1. At the top before they start falling
2. When they first begin moving
3. When they are halfway to the bottom
4. When they reach the bottom of the fall
8.
A 37 N object is lifted to a height of 3 meters. What is the potential energy of this object?
1. 12.3 J
2. 111 J
3. 11.1 J
4. 1.23 J
9.
What potential energy is acquired by a hammer with a mass of 0.75 kg when raised 0.35 m?
1. 2.57 J
2. 0.2625 J
3. 2.14 J
4. None of the Above
10.
A 10-kg rock is thrown up. It is moving at 9 m/s. What is its potential energy at the top? (Hint: conservation of energy)
1. 405 J
2. 300 J
3. 1000 J
4. 500 J
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