A box of mass 4kg is placed on a wooden planck of length 1 5m lying on the ground The - Physics -

Question

A box of mass 4kg is placed on a wooden planck of length 1 5m
lying on the ground The planc is slowly lifted from one end up to a
vertical height of 0 5m at which point the box begins to fall down
Calculate coefficient of friction

Ashish Jain · Accepted Answer

Given: m = 4 kg, distance(s) = 1 5 m , h = 0 5 m
when the box just begins to slide mgcosθ=R, mgsinθ
=μR which implies thatmgsinθ =
μmgcosθμ=tanθ=hs2-h2=0 5(1 5)2-(0 5)2=0 52=0
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A box of mass 4kg is placed on a wooden planck of length 1.5m lying on the ground.The planc is slowly lifted from one end up to a vertical height of 0.5m at which point the box begins to fall down.Calculate coefficient of friction.