|MLA Citation:||Bloomfield, Louis A. "Question 66"|
How Everything Works 20 Mar 2018. 20 Mar 2018 <http://howeverythingworks.org/print1.php?QNum=66>.
The car's powered wheels turn for a different reason: they are driven by a torque from the car's engine. As you step on the accelerator, the engine exerts a torque on the wheels and they begin to turn. They would skid backward across the ground where it not for static friction between the wheels and the ground. This static friction opposes the skidding by exerting a forward force on the bottom surface of the wheels. This static frictional force produces a torque on the wheels and that torque partly balances the torque from the engine. The wheels don't skid and they're angular velocities increase relatively slowly. However, the forward frictional force on the wheel's bottom surface isn't balanced elsewhere in the car and the car experiences a forward net force. The car accelerates forward.