# The power of running

I was thinking... We could calculate the power of a runner by using the equation $$P = fv$$, supposing his velocity constant. But so raise me a question: What makes possible to run is the friction, so there is one force pointing acting on him in forward direction since he is pushing the floor back. Now, if he is at constant velocity, the net force should be zero, the question is so what is the other force pointing behind the person?

• if you know about a force in action then it is sure that it can't move with a constant velocity . Oct 25 '20 at 18:29