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Quiz: Newton's Laws Of Motion And Fbds

20 Questions
Quiz: Newton

Sample quiz for Newton's laws of motion and free-body diagrams.

Questions and Answers
  • 1. 
    When analyzing dynamics problems, free-body diagrams
    • A. 

      Should always be used

    • B. 

      Are more useful when analyzing horizontal forces than when analyzing vertical forces

    • C. 

      Should include only the forces that are directly responsible for the acceleration

    • D. 

      Should be used only when objects are accelerating

    • E. 

      Only apply to objects in equilibrium

  • 2. 
    • A. 

      24 N [S], 14 N [E]

    • B. 

      14 N [S], 24 N [E]

    • C. 

      12 N [S], 12 N [E]

    • D. 

      6 N [S], 10 N [E]

    • E. 

      10 N [S], 6 N [E]

  • 3. 
    A hockey puck slides along an ice surface shortly after it has left the hockey stick that propelled it. Which of the following free-body diagrams best represents the hockey puck?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

    • E. 

      E

  • 4. 
    Study the free-body diagram below and choose the statement that best describes the object's motion.
    • A. 

      The object will accelerate north.

    • B. 

      The object will be motionless.

    • C. 

      The object will accelerate northeast.

    • D. 

      The object will travel with uniform motion.

    • E. 

      The object will travel north with a constant velocity.

  • 5. 
    Study the free-body diagram below and determine what additional force(s) would be required for the object to achieve uniform motion.
    • A. 

      1 N [W]

    • B. 

      1 N [E]

    • C. 

      2 N [N] and 1 N [W]

    • D. 

      2 N [S] and 1 N [E]

    • E. 

      2 N [S] and 1 N [W]

  • 6. 
    The free-body diagram below illustrates the forces acting on a 2.0-kg object as it is being pushed along a horizontal surface. What is the motion of the object?
    • A. 

      Moving at 5.3 m/s2

    • B. 

      Moving at 3.1 m/s

    • C. 

      Moving at 5.3 m/s

    • D. 

      Moving at 3.1 m/s2

    • E. 

      Not moving

  • 7. 
    The free-body diagram of a 4.0-kg object is shown below. What additional force must act so that the object has an acceleration of 2.5 m/s2 [W]?
    • A. 

      14.0 N [W]

    • B. 

      10.0 N [W]

    • C. 

      8.0 N [W]

    • D. 

      6.0 N [W]

    • E. 

      4.0 N [W]

  • 8. 
    Two identical arrows, A and B, are fired with different bows. The bow that fires arrow A exerts twice the average force as the bow that fires arrow B. Compare the accelerations of the two arrows.
    • A. 

      Arrow B will have twice the acceleration of arrow A.

    • B. 

      Arrow A will have twice the acceleration of arrow B.

    • C. 

      Arrow A and arrow B will have the same acceleration.

    • D. 

      Arrow B will have four times the acceleration of arrow A.

    • E. 

      Arrow A will have four times the acceleration of arrow B.

  • 9. 
    A hockey puck of mass 150 g is sliding south along the ice and slows at a rate of 1.2 m/s2. What is the net force acting on the puck?
    • A. 

      1.8 x 102 N [N]

    • B. 

      1.8 x 102 N [S]

    • C. 

      1.8 x 101 N [N]

    • D. 

      1.8 x 10-1 N [N]

    • E. 

      1.9 x 10-1 N [S]

  • 10. 
    Newton's third law essentially states
    • A. 

      Objects won't move unless pushed

    • B. 

      Acceleration only occurs if there is net force

    • C. 

      The acceleration of an object depends on its mass and the net force acting on it

    • D. 

      Objects which are moving tend to stay moving

    • E. 

      Forces always occur in pairs

  • 11. 
    Which of the following observations would be adequately explained by Newton's third law?
    • A. 

      When turning a corner, a passenger in a car is pushed against the door.

    • B. 

      A skater stands on a frictionless pond, tosses her bag in one direction and she accelerates in the opposite direction.

    • C. 

      The normal force on an object is always equal to the force of gravity acting on the same object.

    • D. 

      The friction of a surface causes a sliding object to come to rest.

    • E. 

      When firing a rifle, the force of the rifle on the bullet, is greater than the force of the bullet back on the rifle.

  • 12. 
    If the force of gravity that the earth exerts on you is considered to be the action force then, according to Newton's third law, the corresponding reaction force would be the
    • A. 

      Force of gravity you exert on the Earth

    • B. 

      Normal force of the Earth acting upward on you

    • C. 

      Force your feet exert downward on the Earth

    • D. 

      Force you exert on your feet, pressing them against the Earth

    • E. 

      Force of gravity the Earth exerts on everything else

  • 13. 
    An object is pushed horizontally at a constant velocity. What can correctly be said about the forces acting on the object?
    • A. 

      The force(s) acting forward is/are greater than the force(s) acting backward.

    • B. 

      The sum of all forces is zero.

    • C. 

      The sum of all forces has a value directed forward.

    • D. 

      The forces acting on the object can be said to be “unbalanced.”

    • E. 

      Newton’s second law best summarizes the effect of the forces acting on the object.

  • 14. 
    Which of the following units is equivalent to a newton (N)?
    • A. 

      Kg·m/s2

    • B. 

      G·cm/s

    • C. 

      Kg·s2/m

    • D. 

      Kg·m/s

    • E. 

      Kg·cm/s2

  • 15. 
    A 4.0-kg object, A, and a 2.0-kg object, B, are connected with a rope. A force is applied to another rope attached to the 2.0-kg object that pulls both A and B along a horizontal surface. Which of the following statements is true?
    • A. 

      The force that B exerts on A is greater than the force that A exerts on B.

    • B. 

      The force that A exerts on B is greater than the force that B exerts on A.

    • C. 

      The force that B exerts on A is equal to the force that A exerts on B regardless of the motion of the system.

    • D. 

      The force that B exerts on A is equal to the force that A exerts on B provided that the system slides with uniform motion.

    • E. 

      The sum of the applied force and the force that B exerts on A is equal to the force that A exerts on B.

  • 16. 
    Three masses are suspended vertically as shown in the diagram below. The system is accelerating upward. What is the relationship among the forces of tension?
    • A. 

      |FT1| = |FT2| = |FT3|

    • B. 

      |FT1| > |FT2| > |FT3|

    • C. 

      |FT1| < |FT2| < |FT3|

    • D. 

      |FT1| > |FT2| < |FT3|

    • E. 

      |FT1| > |FT3| < |FT2|

  • 17. 
    The physical quantity, which is the measure of inertia, is
    • A. 

      Density

    • B. 

      Weight

    • C. 

      Force

    • D. 

      Acceleration

    • E. 

      Mass

  • 18. 
    Which law is in control of a spaceship which cruises through space at constant speed without using any fuel?
    • A. 

      Newton's first law

    • B. 

      Newton's second law

    • C. 

      Newton's third law

    • D. 

      Both A and B

    • E. 

      All of the above

  • 19. 
    An object is hanging by two strings, A and B, anchored to the ceiling as in the diagram below.  Each string holds the object in place with a force of 40 N at 30 degrees to the vertical.  Determine the force of gravity required to keep the object motionless.
    • A. 

      35 N [down]

    • B. 

      46 N [down]

    • C. 

      69 N [down]

    • D. 

      80 N [down]

    • E. 

      92 N [down]

  • 20. 
    Describe the motion of the 2.0 kg mass below in the horizontal plane.
    • A. 

      The object accelerates at 1.5 m/s2 [right]

    • B. 

      The object accelerates at 11 m/s2 [right]

    • C. 

      The object accelerates at 12 m/s2 [right]

    • D. 

      The object accelerates at 13 m/s2 [right]

    • E. 

      The object does not accelerate

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