1. The problem statement, all variables and given/known data A box of books that weighs 40N is dragged at a speed of 1.5 m/s across a rough floor. If the coefficient of friction between the floor and the box is 0.20, what is the rate at which heat energy is dissipated? 2. Relevant equations Friction: f=μN Work: W=F*d Power: P=W/t 3. The attempt at a solution My assumption would be if the units of power are watts, or kgm2/s3, breaking that up would be : kg*m/s2*m/s and the box weighs 40N, so kg*m/s2=40, and v=1.5m/s With the coefficient of friction being 0.20, would the answer be 40*1.5*0.2= 12W ?