A1,240-N crate is being pushed across a level floor at a constant speed by a for

Question

A1,240-N crate is being pushed across a level floor at a constant speed by a force vector F of 295N at an angle of 20.0 degree below the horizontal, as shown in the figure (a) below. (a) What is the coefficient of kinetic friction between the crate and the floor? ?k= (b) If the 295-N force is instead pulling the block at an angle of 20.0? 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). m/s^2

Explanation / Answer

a)Fcos20-f=ma=0 (net force equation)

f=u(mg+Fsin20)

u=Fcos20/(mg+Fsin20)=0.813

b)Fcos20-f=ma

f=u(mg-Fsin20)=113.12N

ma=181.88 N

a=7.43 m/s2

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