# Turning Effects Of Forces- An Jun

10 Questions | Attempts: 291
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• 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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