# Physics

A horizontal force of 45N applied to a crate of mass 9kg is just sufficient to move it. If the crate is now pulled at an angle of 50° to the horizontal, find the force required to move the crate over the horizontal surface. (g=10m/s2)

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1. Mg = 9*10 = 90 N. = Wt. of crate.
F = 45 N. = applied force.
Fs = force of static friction.

F-Fs = Ma
45-Fs = 9*0 = 0
Fs = 45 N.

F*cos50 = 45
F = 70 N. = required force.

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