A problem by Vishudh Nagpal
Level
pending
a block of mass m is kept on rough horizontal surface .what is the min. force required to move object (a = friction coefficient )
a(mg+N) (N =normal)
a*mg
a*mg/(cos theta + sin theta )
a
m
N
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1 solution
Try pulling the block at an angle θ : this will reduce the normal force and hence the friction. This in turn would reduce the min force required. There is an optimum θ , beyond which you are more likely to lift it up rather than pull it along the horizontal surface.