The force required to make the box move with constant speed is equal to the force of friction, which is equal to the coefficient of kinetic friction multiplied by the normal force, or 200N x 0.30 = 60N.
If M exceeds a certain critical value, the man cannot push the box up the ramp. The critical value of M is equal to the ratio of the force of friction to the normal force, or 0.30.
A man pushes a 200N box of books in a ramp by pushing horizontally on it as shown. The coefficent of kinetic friction is 0.30. What force must be exert to make the box move with constant speed? Suppose M is greater than 0.3; show that if exceeds a certain critical value, the man cannot push the box up the ramp. Find the critical value of M.
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