Exam 4 Physics Numbers 11-15 2016-2017
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15. Which of the following is evidence that frictional forces are present in a system?
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A. Interactions in the system cause an increase in temperature.
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B. Interactions in the system produce sound.
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C. Mechanical energy is not conserved.
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D. all of the above
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12. The mechanical energy of a system of objects is
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A. the sum of kinetic energy and gravitational potential energy.
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B. the sum of kinetic energy and elastic potential energy.
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C. the sum of kinetic energy and all relevant forms of potential energy.
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D. the sum of all forms of energy.
Correct Answer
A. C. the sum of kinetic energy and all relevant forms of potential energy. -
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13. Mechanical energy is not conserved when
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A. gravitational potential energy is converted to kinetic energy.
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B. kinetic energy is converted to gravitational potential energy.
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C. kinetic energy is converted to elastic potential energy.
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D. friction cannot be ignored.
Correct Answer
A. D. friction cannot be ignored. -
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14. In which of the following situations is mechanical energy ALMOST conserved?
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A. A football flies through the air.
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B. A feather falls from the sky.
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C. A figure skater gliding on the ice.
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D. A hockey player digs his skates into the ice.
Correct Answer
A. C. A figure skater gliding on the ice. -
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11. Which of the following is true of the conservation of energy?
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A. Kinetic energy is always conserved.
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B. Potential energy is always conserved.
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C. Mechanical energy is always conserved.
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D. Total energy is always conserved.
Correct Answer
A. D. Total energy is always conserved. -
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Mar 20, 2022Quiz Edited by
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Dec 09, 2015Quiz Created by
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