Question

A body of weight w rest on a rough horizontal plane.The least horizontal force that can move the body along the plane is W ÷√3 .Then the limiting angle of friction for those two surface in contact is:
1)30°
2)45°
3)60°
4)None

Answer 1

#BAL

Given :

Weight W rest on a rough horizontal plane.

Angle of friction = theta

We know that,

F = mg

mg = W

Angle of friction = Angle of repose

Since,

When a body is kept on an inclined plane inclined at an angle equal to angle of repose then it will be ready to move.

Therefore,

F = mg × sin theta

F = W sin theta

Hence,

W sin theta is the required answer

Answer 2

Explanation:

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