A box with a mass of 44.0 kg is pushed with a horizontal force of 150 N. The box moves at a constant speed across a level, rough floor a distance of 7.10 m.   (a) What is the work done (in J) by the 150 N force?   (b) What is the coefficient of kinetic friction between the box and the floor?

A 121-kg crate is being pushed across a horizontal floor by a force P that makes an angle of 25.5 ° below the horizontal. The coefficient of kinetic friction is 0.219. What should be the magnitude of P, so that the net work done by it and the kinetic frictional force is zero?

A 3.8-kg block is pushed 2.1 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 8 = 30° with the horizontal, as shown in the figure below. If the coefficient of kinetic friction between block and wall is 0.30, determine the following. (a) the work done by F Ⓡ (b) the work done by the force of gravity J (c) the work done by the normal force between block and wall J (d) By how much does the gravitational potential energy increase during the block's motion? J

A horizontal force of 150 N is used to push a 41.5-kg packing crate a distance of 6.05 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following. (a) the work done by the 150-N force (b) the coefficient of kinetic friction between the crate and the surface