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A 1,380-N crate is being pushed across a level floor at a constant speed by a fo

ID: 2138126 • Letter: A

Question

A 1,380-N crate is being pushed across a level floor at a constant speed by a force of 230 N at an angle of 20.0 degree below the horizontal, as shown in the figure (a) below. What is the coefficient of kinetic friction between the crate and the floor? If the 230-N force is instead pulling the block at an angle of 20.0 degree above the horizontal, as shown in the figure (b), what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).

Explanation / Answer

ma =Fcos 20 -mu(mg-Fsin20) given weight w= 1380 N

applied force F = 230 N at an angle of 20.0

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