Turning Effects Of Forces- An Jun

10 Questions | By Anganjun | Updated: Mar 21, 2022 | Attempts: 291

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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
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