Exam 4 Physics Numbers 11-15 2016-2017
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- 1.11. Which of the following is true of the conservation of energy?
- A.
A. Kinetic energy is always conserved.
- B.
B. Potential energy is always conserved.
- C.
C. Mechanical energy is always conserved.
- D.
D. Total energy is always conserved.
- 2.12. The mechanical energy of a system of objects is
- A.
A. the sum of kinetic energy and gravitational potential energy.
- B.
B. the sum of kinetic energy and elastic potential energy.
- C.
C. the sum of kinetic energy and all relevant forms of potential energy.
- D.
D. the sum of all forms of energy.
- 3.13. Mechanical energy is not conserved when
- A.
A. gravitational potential energy is converted to kinetic energy.
- B.
B. kinetic energy is converted to gravitational potential energy.
- C.
C. kinetic energy is converted to elastic potential energy.
- D.
D. friction cannot be ignored.
- 4.14. In which of the following situations is mechanical energy ALMOST conserved?
- A.
A. A football flies through the air.
- B.
B. A feather falls from the sky.
- C.
C. A figure skater gliding on the ice.
- D.
D. A hockey player digs his skates into the ice.
- 5.15. Which of the following is evidence that frictional forces are present in a system?
- A.
A. Interactions in the system cause an increase in temperature.
- B.
B. Interactions in the system produce sound.
- C.
C. Mechanical energy is not conserved.
- D.
D. all of the above
Questions: 10 | Attempts: 126 | Last updated: Oct 20, 2018
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Sample QuestionWhich of the following is true of the conservation of energy in a closed system?
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