Final answer:
The forces that act on a car to make it go or stop include engine force, frictional force, and aerodynamic drag. The engine force pushes the car forward, while the frictional force from the brakes slows it down. Aerodynamic drag opposes the car's motion and must be overcome to maintain a constant speed.
Step-by-step explanation:
There are several forces that act on a car to make it either go or stop:
- Engine Force: This force is generated by the car's engine, which pushes the car forward and allows it to accelerate. When you press the gas pedal, the engine force increases, causing the car to go faster.
- Frictional Force: When you press the brakes, the brake pads exert a frictional force on the wheels, which slows down the car and brings it to a stop. The friction between the tires and the road also provides the necessary force to propel the car forward.
- Aerodynamic Drag: When a car is moving, it experiences resistance from the air, known as aerodynamic drag. This force acts opposite to the direction of motion and tends to slow down the car. To overcome this force and maintain a constant speed, the engine force must be greater than the aerodynamic drag force.