Preap Physics Final Exam

34 Questions | Total Attempts: 129

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Preap Physics Final Exam

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Questions and Answers
  • 1. 
    Which of the following situations represents a positive displacement of a carton? Assume positive position is measured vertically upward along a y-axis.
    • A. 

      A. A delivery person waiting for an elevator lowers a carton onto a dolly.

    • B. 

      B. When the elevator doors open, the delivery person lifts the dolly over the threshold of the elevator.

    • C. 

      C. The delivery person pushes the dolly to the back of the elevator while pressing a floor button.

    • D. 

      D. The door closes and the elevator moves from the 10th to the 4th floors.

  • 2. 
    During which interval is the cat at rest?
    • A. 

      a. 0.05.0 s

    • B. 

      b. 5.010.0 s

    • C. 

      C. 10.015.0s

    • D. 

      D. 15.020.0 s

  • 3. 
    While a car travels around a circular track at constant speed, its
    • A. 

      A. acceleration is zero

    • B. 

      B. velocity is zero

    • C. 

      Both acceleration and velocity are zero.

    • D. 

      D. none of these choices

  • 4. 
    What does the graph on the right illustrate about acceleration?
    • A. 

      a. The acceleration varies.

    • B. 

      b. The acceleration is zero.

    • C. 

      c. The acceleration is constant.

    • D. 

      d. The acceleration increases then becomes constant.

  • 5. 
    A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?
    • A. 

      a. midway on the way up

    • B. 

      b. at the top of its path

    • C. 

      c. the instant it leaves the catcher’s hand

    • D. 

      d. the instant before it arrives in the catcher’s mitt

  • 6. 
    Which of the following is a physical quantity that has both magnitude and direction?
    • A. 

      A. Vector

    • B. 

      B. Scalar

    • C. 

      C. Resultant

    • D. 

      D. frame of reference

  • 7. 
    In the figure below, which diagram represents the vector addition,C = A + B?
    • A. 

      A. I

    • B. 

      B. II

    • C. 

      C. III

    • D. 

      D. IV

  • 8. 
    The components of a vector are
    • A. 

      A. each equal to half the magnitude of the vector.

    • B. 

      B. independent of the orientation of the vector.

    • C. 

      C. perpendicular.

    • D. 

      D. vector quantities.

  • 9. 
    The motion of a projectile in free fall is characterized by
    • A. 

      A. ax = ay = -g.

    • B. 

      B. ax = constant and vy = constant.

    • C. 

      C. vx = constant and ay = -g.

    • D. 

      D. vx = constant and vy = constant.

  • 10. 
    The net force acting on an object is zero.  Based on this information, which statement about the object is FALSE?
    • A. 

      A. The velocity must be zero.

    • B. 

      B. The velocity must be constant.

    • C. 

      C. The acceleration must be zero.

    • D. 

      D. The momentum must be constant

  • 11. 
    In the free-body diagram shown to the right, which of the following is the gravitational force acting on the car?
    • A. 

      A. 5800 N

    • B. 

      B. 14 700 N

    • C. 

      C. 775 N

    • D. 

      D. 13 690 N

  • 12. 
    If a nonzero net force is acting on an object, then the object is definitely
    • A. 

      A. at rest

    • B. 

      B. being accelerated.

    • C. 

      C. moving with a constant velocity

    • D. 

      D. losing mass.

  • 13. 
    In which situation is the net force acting on a car zero?
    • A. 

      A. The car increases speed and changes direction.

    • B. 

      B. The car increases speed but does not change direction.

    • C. 

      C. The car maintains its speed but changes direction.

    • D. 

      D. The car maintains both its speed and direction.

  • 14. 
    A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation.
    • A. 

      A. The nail exerts a force on the hammer; the hammer exerts a force on the wood.

    • B. 

      B. The hammer exerts a force on the nail; the wood exerts a force on the nail.

    • C. 

      C. The hammer exerts a force on the nail; the nail exerts a force on the hammer.

    • D. 

      D. The hammer exerts a force on the nail; the hammer exerts a force on the wood.

  • 15. 
    Work is done on an object
    • A. 

      A. whenever a force acts on the object.

    • B. 

      B. whenever a force is perpendicular to the displacement of the object.

    • C. 

      C. whenever a force causes a displacement of the object.

    • D. 

      D. whenever a net force acts on the object.

  • 16. 
    The main difference between kinetic energy and potential energy is that
    • A. 

      A. kinetic energy involves position, and potential energy involves motion.

    • B. 

      B. kinetic energy involves motion, and potential energy involves position.

    • C. 

      C. although both energies involve motion, only kinetic energy involves position.

    • D. 

      D. although both energies involve position, only potential energy involves motion.

  • 17. 
    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.

  • 18. 
    When comparing the momentum of two moving objects, which of the following is correct?
    • A. 

      A. The object with the higher velocity will have less momentum if the masses are equal.

    • B. 

      B. The more massive object will have less momentum if its velocity is greater.

    • C. 

      C. The less massive object will have less momentum if the velocities are the same.

    • D. 

      D. The more massive object will have less momentum if the velocities are the same.

  • 19. 
    When two ice skaters initially at rest push off one another, their final momenta are
    • A. 

      A. equal in magnitude and direction.

    • B. 

      B. equal in magnitude and opposite in direction.

    • C. 

      C. in the same direction but of different magnitudes

    • D. 

      D. in opposite directions and possibly of different magnitudes.

  • 20. 
    Two objects stick together and move with a common velocity after colliding. Identify the type of collision.
    • A. 

      A. Elastic

    • B. 

      B. Inelastic

    • C. 

      C. Perfectly elastic

    • D. 

      D. perfectly inelastic

  • 21. 
    In what kind of collision is kinetic energy always conserved?
    • A. 

      A. elastic collision

    • B. 

      B. inelastic collision

    • C. 

      C. perfectly elastic collision

    • D. 

      D. perfectly inelastic collision

  • 22. 
    What term describes a force that causes an object to move in a circular path?
    • A. 

      A. circular force

    • B. 

      b. centripetal acceleration

    • C. 

      c. centripetal force

    • D. 

      d. centrifugal force

  • 23. 
    The law of universal gravitation states that 
    • A. 

      A. two objects always exert gravitational forces on each other.

    • B. 

      B. the force of gravity depends on the mass and the distance between the two objects.

    • C. 

      C. all objects fall at different rates on earth.

    • D. 

      D. both a and b.

  • 24. 
    How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?
    • A. 

      a. It would increase by a factor of 2.

    • B. 

      b. It would increase by a factor of 4.

    • C. 

      c. It would decrease by a factor of 2.

    • D. 

      d. The speed would not change.

  • 25. 
    Which of the following statements is correct?
    • A. 

      A. The closer the force is to the axis of rotation, the less torque is produced.

    • B. 

      B. The closer the force is to the axis of rotation, the easier it is to rotate the object.

    • C. 

      C. The farther the force is from the axis of rotation, the harder it is to rotate the object.

    • D. 

      D. The farther the force is from the axis of rotation, the less torque is produced.

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