Posted by Jacob on Tuesday, April 13, 2010 at 8:19pm.
A box is pulled across a horizontal surface at a constant speed by a horizontal rope with tension T=30N. The coefficient of friction between the box and surface is uk = 0.05.
1. Calculate the work done by friction as the box moves 4 meters to the right.
i thought it would be .05 x 30 x 4 since work is F x D but it isn't
2. What is the mass of the box.

physics  drwls, Tuesday, April 13, 2010 at 8:45pm
Multiply pulling force by distance for the work done.
Use the uk value to get the mass of the boss.
Friction force = M*g*uk