Question

A wooden block of mass 100 kg rest on a flat wooden floor, the coefficient of friction b/w the two being 0.4.The block is pulled by a rope making an angle of 30 degree with the horizontal.What is the minimum tension along the rope that just makes the block sliding ?

Answer 1

M not from Arya Gurukul though now..

Answer 2

see fbd in given photo

as u can see to move the block on wooden flat surface horizontal component is used i.e FcosФ

FcosФ=0.4*100*10
Fcos30°=400
F*$\sqrt{3}$/2=400
f=800/$\sqrt{3}$N