Turning Effects Of Forces- An Jun

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Turning Effects Of Forces- An Jun - Quiz

Take this short 10 questions quiz to test yourself about your knowledge of moments and to pass mr tieu's test!


Questions and Answers
  • 1. 

    What is the moment of a force?

  • 2. 

    A non uniform beam AB of mass 20kg and length 12m has an object of mass 40kg placed at a point 8m from A. The beam is in equilibrium in a horizontal position resting on a support C at the midpoint of AB.  Find the position of the centre of mass.Ans: y=4m

  • 3. 

    A uniform rod AB of weight 70N and length 5m.  It rests in a horizontal position supported at point C and D, where AC = 0.4m.  the reaction on the rod at C has magnitude 9N. Find       a)    the magnitude of the reaction on the rod at D       b)   the distance AD.

  • 4. 

    A uniform rod AB of length 6m and mass 40Kg.  It is supported by two smooth pivots in a horizontal position at A and C where AC = 3m.  A woman! of mass 75Kg stands on the rod which remains in equilibrium.  The magnitudes of the reactions at the two pivots are equal to R Newtons.Find       a) the value of R.       b) the distance of the woman from A.

  • 5. 

    A non uniform plank of wood AB of length 10m and mass 100Kg.  The plank is smoothly supported in a horizontal position at A and B.  An object of mass 90Kg is put on the plank at C, where AC = 6m.  The plank is in equilibrium and the magnitudes of the reactions at A and B are equal .  Find: a) the magnitude of the reaction R, on the plank at B. b) the distance, x, of the centre of mass of the plank from A.

  • 6. 

    The turning effect of a force on a door is greater when it is applied at

    • A.

      A point near the hinges and perpendicular to the door

    • B.

      A point near the hinges and parallel to the door

    • C.

      a point far away from the hinges and perpendicular to the door

    • D.

      A point far away from the hinges and parallel to the door

    Correct Answer
    C. a point far away from the hinges and perpendicular to the door
    Explanation
    When a force is applied at a point far away from the hinges and perpendicular to the door, it creates a larger turning effect or torque. This is because the distance between the point of application and the axis of rotation (hinges) is greater, resulting in a longer lever arm. The longer the lever arm, the greater the torque produced by the force. Additionally, the force being applied perpendicular to the door allows for the maximum rotational effect. Therefore, the combination of a point far away from the hinges and perpendicular to the door creates the greatest turning effect.

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  • 7. 

    Two equal and oppositely directed forces acting on an object will be in equilibrium

    • A.

      Only if they act on the same point on the object

    • B.

      if they are separated by a distance

    • C.

      When they are balanced by a third force

    • D.

      When their moments about the same point are equal

    Correct Answer
    D. When their moments about the same point are equal
    Explanation
    Two equal and oppositely directed forces acting on an object will be in equilibrium when their moments about the same point are equal. This means that the forces are balanced and there is no net torque acting on the object. The concept of moments refers to the rotational effect of a force, and when the moments of the two forces about the same point are equal, they cancel each other out and the object remains in a state of equilibrium.

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  • 8. 

    The cone is in ____________ because if it is tilted slightly, it returns to its _______________________

    Correct Answer
    stable equilibrium; original position without toppling
    Explanation
    The cone is in stable equilibrium because if it is tilted slightly, it returns to its original position without toppling. This means that the cone is balanced and any small disturbance does not cause it to fall over. The cone's shape and weight distribution allow it to maintain its stability and remain upright.

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  • 9. 

    The diagram shows a light beam pivoted at one end. What is the effort required to lift the load?

    • A.

      50

    • B.

      67

    • C.

      100

    • D.

      200

    Correct Answer
    A. 50
    Explanation
    The diagram shows a light beam that is pivoted at one end. The effort required to lift the load is represented by the value of 50.

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  • 10. 

    Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down?

    • A.

      Jack

    • B.

      Jill

    • C.

      Both of them

    • D.

      None of them

    Correct Answer
    B. Jill
    Explanation
    Jill will move down because the see-saw will rotate around the pivot point due to the imbalance of weights. The torque exerted by Jill's weight is greater than the torque exerted by Jack's weight. Torque is calculated by multiplying the weight by the distance from the pivot. Since Jill's weight is greater and she sits closer to the pivot, her torque is larger, causing the see-saw to rotate in her direction and move her down.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Aug 09, 2010
    Quiz Created by
    Anganjun
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