In the equation P=Fv, I am unsure of what exactly the force reprents. Let's say that there is a car of mass 1000kg travelling at a constant velocity 30m/s, driven by an engine developing 25kW. Since F=P/v, F= 833.33N. However, this is clearly not the resultant force on the car - since the resultant force is 0N. Does this mean that resistive forces must be 833.33N? If so, please can someone explain why a force is needed for this motion? Also, if the power were to be increased, would the force increase, or the velocity increase?
Reference https://www.physicsforums.com/threads/p-fv-what-force-represents.243000/