Here's why:
* Friction: The tires of the car grip the road surface. This grip creates friction between the tires and the road.
* Newton's Third Law: For every action, there is an equal and opposite reaction. When the tires push backward against the road (action), the road pushes forward against the tires (reaction). This forward push from the road is the force that accelerates the car.
Think of it this way: If you push against a wall, the wall pushes back on you. The same principle applies to a car and the road.
