To move a large crate across a rough floor, you push down on it at an angle of 21°. Find the force necessary to start the crate moving, given that the mass of the crate is m = 32 kg and the coefficient of static friction between the crate and the floor is 0.57.(adsbygoogle = window.adsbygoogle || []).push({});

N=mg=(32)(9.81)= 313.92 * coefficaint of mew sub s=.57=178.9

Ok, I think I did that right....only I'm not sure what to do with the 21° angle. I did 178.9cos(21)=167.0 but that's not right.

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# Homework Help: Kinetic friction

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