Turning Effects Of Forces- An Jun

10 Questions | Total Attempts: 226

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Turning Effects Of Forces- An Jun

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

  • 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

  • 8. 
    The cone is in ____________ because if it is tilted slightly, it returns to its _______________________
  • 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

  • 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

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