A weight W rests on a horizontal plane. What will be the least force to move the body along the plane if angle of friction is theta.
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'W' is lying on a horizontal plane.
So, Theta = Ang. of friction.
We've
F = mg
mg = W -----------> [1] ,also
Ang of response = Ang of friction.
If we analyse the FBD of the weight, we get
F = mg sin(theta)
F = W sin(theta). [from 1]
Therefore,
The least force will be W sin(theta).
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