Modified True/False
Indicate
whether the sentence or statement is true or false. If false, change the identified word or
phrase to make the sentence or statement true.
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1.
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When
work is done on an object, the object gains energy. _________________________
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2.
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The
kinetic energy of a book on a shelf is equal to the work done to lift the book to the shelf.
_________________________
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3.
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A
compressed spring has elastic potential energy. _________________________
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4.
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An
ice cube melts when its mechanical energy increases. _________________________
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5.
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A
light bulb converts electrical energy into electromagnetic energy.
_________________________
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6.
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In a
machine, work output is less than work input because some energy is converted into thermal
energy. _________________________
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7.
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Animals, algae, and certain bacteria convert energy from sunlight into chemical
energy through the process of photosynthesis. _________________________
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8.
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During combustion, a fuel’s electromagnetic energy is converted into
thermal energy. _________________________
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9.
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Energy is the rate at which work is done.
_________________________
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10.
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A
100-watt light bulb converts electrical energy into electromagnetic energy at a slower rate
than a 40-watt light bulb. _________________________
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Essay
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11.
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Describe the energy of a bowling ball as it rolls toward and hits a bowling
pin.
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12.
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Describe six different forms of energy.
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13.
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Describe two energy conversions that take place when you warm a cup of cocoa in a
microwave oven.
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14.
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A
1-kg cart slams into a stationary 1-kg cart at 2 m/s. The carts stick together and move forward at a
speed of 1 m/s. Determine whether kinetic energy was conserved in the collision. Use the law of
conservation of energy to explain the collision.
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15.
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Explain how both plants and animals stored the energy found in fossil
fuels.
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16.
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A
generator supplies 15,000 J of electrical energy each minute. Determine the maximum number of 100-W
light bulbs that the generator can power.
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17.
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A
1200-kg car reaches a speed of 11 m/s from rest in 10 seconds. Determine the car’s
power.
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18.
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How
high must you lift a 25-newton book for it to have the same increase in potential energy as a
20-newton book that was lifted 0.5 m?
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