Asked by nick

an 85kg concrete block rests on a flat surface with coefficient of static friction us=0.42. find the maximum force that can pull on the block with, angle of 38 degrees above the horizontal without moving the block?

please help and show work

Answers

Answered by Henry
M*g = 85 * 9.8 = 833 N. = Wt. of block.

Fn = Mg-F*sin38 = 833 - 0.616F = Normal force.

F*Cos38-u*Fn = M*a.
0.788F - 0.42(833-0.616F) = M*0 = 0, 0.788F - 349.9+0.259F = 0,
1.047F = 349.9, F = 334.3 N.

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