Energy Transfers and Transformations

How would you describe the relationship between the mass of a car and its kinetic energy?

• As the mass of a car increases, its kinetic energy decreases.

• As the mass of a car increases, its kinetic energy increases.

• As the mass of a car decreases, its kinetic energy increases.

• There is no clear relationship between mass and kinetic energy.

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What form of energy does a compressed spring have?

• heat energy

• kinetic energy

• potential energy

• chemical energy

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Which type of energy transformation does NOT describe potential energy being changed into kinetic energy?

• A ball falling off a shelf.

• A bike coasting down a hill.

• Releasing a stretched rubber band.

• Compressing a spring.

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A ball is falling after rolling off a tall roof. The ball has

• potential energy only.

• both kinetic and potential energy.

• kinetic energy only.

• neither kinetic or potential energy.

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A ball is tossed up in the air. At its peak, it stops before beginning to fall. The ball at its peak has

• potential energy only.

• kinetic energy only.

• both kinetic and potential energy.

• neither kinetic or potential energy.

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A soap box derby car at the top of a ramp has more _________ energy and at the finish line at the bottom of the ramp it has more _________ energy.

• kinetic, potential

• kinetic, kinetic

• potential, kinetic

• potential, potential

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A drawn bow possesses mechanical energy in the form of _______________. After the arrow is released, the energy is transformed into _________________.

• elastic kinetic energy; mechanical kinetic energy

• gravitational potential energy; kinetic energy

• potential energy; mechanical energy

• elastic potential energy; kinetic energy

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A new cannon was being developed in a science lab. The instructor wanted to do some testing of the cannon's ability to launch objects with different masses. The instructor used tennis balls and filled them with lead, rocks, and styrofoam. The fourth tennis ball had nothing in it. The instructor fired each tennis ball with the same speed and measured the kinetic energy of each over a period of one second. Determine which tennis ball had rocks in it and explain.

• Green represents rocks because it is not as dense as lead and would likely have less mass than lead.

• Green represents rocks because the rocks would occupy less volume than lead but more than styrofoam.

• Purple represents rocks because it traveled faster than all the other objects since it is less dense.

• Purple represents rocks because it has more mass than all the other objects.

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

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

• just before he starts to fall to the ground

• as he runs forward to plant the pole

• when he initially lands

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Which point on the roller coaster's path represents the maximum kinetic energy?

• D

• C

• B

• A

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