^Oblique pull

^Oblique pull

Suppose a block of mass ‘m’ placed on a rough horizontal plane is pulled by a constant force F acting at an angle θ to horizontal,

let Fsinθ < mg, then,  N = mg – Fsinθ

Force needed to start the block moving is,

Fcosθ = fL

Using law of friction the limiting friction is,

fL = μS N

Combining above equations, we get,

Using tanα = μS, we get,

At θ = α, the force required to pull becomes minimum & given by



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