To move a large crate across a rough floor, you push on it with a force (F) at an angle of 21 degrees below the horizontal. Find the force necessary to start the crate moving, given the mass of the crate is 32 kg and the coefficient of static friction between the crate and the floor is 0.57.
I know that the formulas used are F=ma and I can't find acceleration. I also drew a free body diagram and tried to use trig. to figure out the problem and our teacher gave us the answer sheet we just have to show how to get to the answer (the answer to this problem is 250 N)
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