Exam 4 Target 7 #s 11-15

5 Questions | Total Attempts: 138

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Exam 4 Target 7 #s 11-15

U3T1 Retake


Questions and Answers
  • 1. 
    Which of the following is true of the conservation of energy in a closed system?
    • 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. 
    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. 
    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 is not negligible.

  • 4. 
    In which of the following situations is mechanical energy most likely to be conserved?
    • A. 

      A. A football flies through the air.

    • B. 

      B. A feather falls from the sky.

    • C. 

      C. A skateboard rolls into the grass.

    • D. 

      D. A hockey player digs his skates into the ice.

  • 5. 
    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

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