1. The problem statement, all variables and given/known data A 25.0 kg block slides down a 5.00 m ramp that is elevated at 36.0 degrees. The kinetic friction coeff. is 0.220. -What is the work done by friction as the block slides down the ramp? Ok, so as far as I know, work is achieved only if you apply a force on something and move that something in the same direction as the force. Here, friction is applying a force of 43N (I calculated it), but it's not achieving motion in the same direction. Therefore, work done by friction is 0. Am I right?