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A man pushes a wooden box across the floor at a constant speed of 0.5 m/s by applying a horizontal force of 200N. Wht is the value of the force of friction on the box? Explain your answer.

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Since their is no acceleration, the force of friction(Fk) is = the hor. force applied:

Fap - Fk = M*a
Fap - Fk = M*0 = 0
Fk = Fap = 200 N.

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