Physics

A horizontal force of 150 N is used to push a 32.5-kg packing crate a distance of 4.95 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following.
(a) the work done by the 150-N force?

(b) the coefficient of kinetic friction between the crate and the surface ?

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  1. Wc = m*g = 32.5kg * 9.8N/kg = 318.5 N.=
    Wt. of crate.

    Fc = 318.5N [0o]
    Fp = 318.5*sin(0) = 0 = Force parallel to surface.
    Fv = 318.5*cos(0) = 318.5 N. = Force perpendicular to surface.

    a. Work = F*d = 150 * 4.95 = 742.5 Joules.

    b. Fap-u*Fv = m*a
    150-Fp-u*Fv = m*a
    150-0-318.5u = m*a = m*0 = 0
    318.5u = 150
    u = 0.470.

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