1.

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.

Answer»

️⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️⤵️'W' is LYING on a horizontal plane.So, THETA = Ang. of friction.We'veF = MGMG = W -----------> [1] ,alsoAng of response = Ang of friction.If we analyse the FBD of the WEIGHT, we getF = MG sin(theta)F = W sin(theta). [from 1]Therefore, The least force will be W sin(theta).



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