# physics

A 550 N crate rests on the floor. How much work in joules is required to move it at constant speed 7.0 m along the floor, against a friction force of 150 N?

asked by kassy
1. Fap-Fc-Fs = M*a.
Fap-550-150 = M*0 = 0, Fap = 700 N. = Force applied.

W0rk = Fap*d = 700 * 7.0 = 4900 J.

posted by Henry
2. Correction: Fap-Fs = M*a.
Fap = M*0 + 150 = 150 N. = Force applied.

Work = Fap*d = 150 * 7 = 1050 J.

posted by Henry

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