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A 78.2 N wooden box is pushed with velocity 13.0 m/s across a flat, horizontal, concrete...

A 78.2 N wooden box is pushed with velocity 13.0 m/s across a flat, horizontal, concrete floor. A person pushes against the box at 30 degrees from horizontal, as shown in the figure. Assume:

μk=μk=0.270      μs=μs=0.415

How much Force (Magnitude) is required to keep the box moving at constant velocity?

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Answer #1

Acceleration of box is a-0 ( box moving at constant velocity According to Newtons second law F-mg cos 30°-0 F-Amg cos 30 -(0.270) (78.2 N)cos 30 - 18.3 N

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