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A crate with a weight of 50 N rests on a horizontal surface. A person pulls horizontally on it with a force of 10 N and it does not move. To start it moving, a second person pulls vertically upward on the crate. If the coefficient of static friction is 0.4, what is the smallest vertical force for which the crate moves?
A horizontal force of 150 N is used to push a 40.0kg packing crate a distance of 6.00 m on a rough horizontal surface. If the crate moves at a constant speed, find the work done by the 150-N force.
