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posted by Samantha on Friday, October 22, 2010 at 1:54am.

A 15kg box is resting on a hill forming an angle of a horizontal surface. The coefficient of static friction for the box on the surface is 0.45. Calculate the maximum angle of the incline just before the box starts to move.

Let A be the angle. Friction force = Weight component down incline M g * cos A * 0.45 = M g sinA solve for A. Mg cancels out. (Use arctangent function)

27

Both of the answers above are wrong answer is 24°

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