Exam 3 Target 3 Retake Preap

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Exam 3 Target 3 Retake Preap - Quiz

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Questions and Answers
  • 1. 

    Two forces act on an object in opposite directions from each other. The magnitude of the net force acting on the object

    • A.

      a. equals the sum of the magnitudes of the two forces.

    • B.

      b. equals the difference in the magnitudes of the two forces.

    • C.

      c. equals the average of the two forces.

    • D.

      d. cannot be determined from the given information.

    Correct Answer
    A. a. equals the sum of the magnitudes of the two forces.
    Explanation
    When two forces act on an object in opposite directions, the net force is determined by adding the magnitudes of the two forces together. This is because the forces are acting in opposite directions, so the net force is the difference between the two forces. By adding the magnitudes together, we are essentially finding the difference between the two forces and considering the direction of the resultant force. Therefore, the correct answer is that the magnitude of the net force equals the sum of the magnitudes of the two forces.

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  • 2. 

    If the net force that is acting on an object is zero, then the object is definitely

    • A.

      A. at rest.

    • B.

      B. being accelerated.

    • C.

      C. moving with an increasing velocity.

    • D.

      D. losing mass.

    Correct Answer
    A. A. at rest.
    Explanation
    If the net force acting on an object is zero, it means that all the forces acting on the object are balanced and cancel each other out. In this case, the object will not experience any acceleration and will remain in its current state of motion or rest. Therefore, the object is definitely at rest.

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  • 3. 

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

    • A.

      A. greater than the normal force times the coefficient of static friction.

    • B.

      B. equal to the normal force times the coefficient of static friction.

    • C.

      C. the normal force times the coefficient of kinetic friction.

    • D.

      D. zero.

    Correct Answer
    D. D. zero.
    Explanation
    When a bicycle is moving forward along a level road at a constant velocity, it means that all the forces acting on the bicycle are balanced. In this case, the force of friction between the tires and the road is equal and opposite to the force applied by the cyclist to keep the bicycle moving. Since the forces are balanced, there is no additional force needed to bring the bicycle into equilibrium, hence the correct answer is d. zero.

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  • 4. 

    A single force acts on an object. The components of this force act along the +x-axis and the  -y-axis. The single force that will bring the object into equilibrium has components that act along the

    • A.

      +x-axis and +y-axis.

    • B.

      +x-axis and -y-axis.

    • C.

      -x-axis and +y-axis.

    • D.

      -x-axis and -y-axis.

    Correct Answer
    C. -x-axis and +y-axis.
    Explanation
    The force components acting along the +x-axis and -y-axis cancel out each other, resulting in a net force of zero in the x-direction. However, there is no force component acting along the +y-axis to balance out the force component along the -y-axis. Therefore, the single force that will bring the object into equilibrium must have a component acting along the -x-axis to balance out the force component along the -y-axis. The only option that satisfies this condition is -x-axis and +y-axis.

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  • 5. 

    Which of the following statements describe an object in equilibrium? I.   The object is at rest.II. The object is moving at constant velocity.III. The net external force on the object is zero.

    • A.

      a. I and II

    • B.

      b. I and III

    • C.

      c. II and III

    • D.

      d. I, II, and III

    Correct Answer
    D. d. I, II, and III
    Explanation
    An object in equilibrium means that it is not experiencing any acceleration. Statement I describes an object at rest, which means it is not moving and therefore not accelerating. Statement II describes an object moving at a constant velocity, which also means it is not accelerating. Statement III states that the net external force on the object is zero, which is necessary for the object to remain in equilibrium. Therefore, all three statements accurately describe an object in equilibrium.

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  • Current Version
  • Aug 18, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 21, 2015
    Quiz Created by
    Sfduke

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