A `5 kg ` box is moving staright across the floor at a constant speed by a force of `30 N` as shown in figure

a. How large a friction force impends the motion of the box ?
b. Find `mu_(k)` between the box and the floor

A heavy box is slid across a rough floor with an initial speed of 4 m/s. It stops moving after 8 seconds. If the average resisting force of friction is 10 N, the mass of the box (in kg) is

A heavy box is slid across a rough floor with an initial speed of 4 m/s. It stops moving after 8 seconds. If the average resisting force of friction is 10 N, the mass of the box (in kg) is

A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal force to slide coefficient of friction between the shoes of the boy and the floor is mu and that between the box and the floor is mu' . In which of the following cases it is certainly not possible to slide the box?

A body of mass M is applying horizontal force to slide a box of mass M_(1) on a rough horizontal surface The coefficient of friction between the shoe of the boy and the floor is mu and that between the box and the floor is 'mu_(1)' In which of the following cases is it certainly not possible to slide the box ? .

A student pulls a wooden box along a rough horizontal floor( without the block loosing contact with the floor) at constant speed by means of a force P as shown to the right. (W is weights of block, N is normal reaction on the block, f is force of friction on the block). which of the following must be true?