1. The problem statement, all variables and given/known data Newton's Second Law of motion states that there must be a net force for a body to have an acceleration and that the acceleration is in the direction of the net force. When you push down on the accelerator of a car it accelerates forward. What force is exerted on the car to accelerate it? 2. Relevant equations none 3. The attempt at a solution The accelerator triggers a device in the car which then triggers something that accelerates the car by exerting a force to something. Does the gear wheel spin faster? What I don't understand is the internal workings of the car. This question may not ask it directly but for a complete answer it would be good to incoprate it in or at least mention aspects of the car.