# Exam 4 Physics Numbers 11-15 2016-2017

5 Questions | Total Attempts: 65  Settings  .

• 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 Back to top