Exam 3 Quiz #5

12 Questions | Total Attempts: 175

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Exam 3 Quiz #5

Questions and Answers
  • 1. 
    The length of a force vector represents the
    • A. 

      Cause of the force

    • B. 

      Direction of the force

    • C. 

      Magnitude of the force

    • D. 

      Type of force

  • 2. 
    A free-body diagram represents all of the following except
    • A. 

      The object

    • B. 

      Forces as vectors

    • C. 

      Forces exerted by the object

    • D. 

      Forces exerted on the object

  • 3. 
    In the free-body diagram shown to the right, which of the following is the normal force acting on the car?
    • A. 

      5800 N

    • B. 

      14,700 N

    • C. 

      775 N

    • D. 

      13, 690 N

  • 4. 
    A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is
    • A. 

      Greater than the normal force times the coefficient of static friction.

    • B. 

      Equal to the normal force times the coefficient of static friction.

    • C. 

      The normal force times the coefficient of kinetic friction.

    • D. 

      Zero

  • 5. 
    A small force acting on a human-sized object causes
    • A. 

      A small acceleration

    • B. 

      A large acceleration

    • C. 

      No acceleration

    • D. 

      Equilibrium

  • 6. 
    Two forces act on an object. The magnitude of the net force acting on the object
    • A. 

      Equals the sum of the magnitudes of the two forces.

    • B. 

      Equals the difference in the magnitudes of the two forces.

    • C. 

      Equals the average of the two forces.

    • D. 

      Cannot be determined from the given information.

  • 7. 
    A newton is equivalent to which of the following quantities?
    • A. 

      Kg

    • B. 

      Kg•m/s^2

    • C. 

      Kg•m/s

    • D. 

      Kg•(m/s)^2

  • 8. 
     If a nonzero net force is acting on an object, then the object is definitely
    • A. 

      At rest

    • B. 

      Being accelerated

    • C. 

      Moving with constant velocity

    • D. 

      Losing mass

  • 9. 
    A cabinet initially at rest on a horizontal surface requires a 115 N horizontal force to set it in motion. If the coefficient of static friction between the cabinet and the floor is 0.38, what is the normal force exerted on the cabinet?
    • A. 

      303 N

    • B. 

      44 N

    • C. 

      12 N

    • D. 

      1128 N

  • 10. 
     A 20.0 kg trunk is pushed across the floor of a moving van by a horizontal force. If the coefficient of kinetic friction between the trunk and the floor is 0.255, what is the magnitude of the frictional force acting on the trunk?
    • A. 

      3 N

    • B. 

      769 N

    • C. 

      196 N

    • D. 

      50 N

  • 11. 
     A passenger with a mass of 60.0 kg is standing in a subway car that is accelerating at 3.70 m/s2. If the coefficient of static friction between the passenger’s shoes and the car floor is 0.455, will the passenger be able to stand without sliding? Prove your answer.
    • A. 

      Yes; Fs= 268 N and Fa= 222 N

    • B. 

      No; Fs= 268 N and Fa= 222 N

    • C. 

      Yes; Fs= 222 N and Fa= 268 N

    • D. 

      No; Fs= 222 N and Fa = 268 N

  • 12. 
    A 90.0 kg skier glides down a slope with an incline of 17.0°. What frictional force is needed for the skier to move at a constant velocity?
    • A. 

      883 N

    • B. 

      258 N

    • C. 

      844 N

    • D. 

      323 N

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