What happens when a car drives at a constant speed?

When a car drives at a constant speed, the driving force of the engine is acting to the left. While because the car is moving at a constant speed, there needs to be an equal force acting to the right. And these forces that oppose the motion of the body are called resistive forces. In this example, the resistive forces are friction with the air and friction with the road. Although in general, resistive forces include friction, viscosity and drag, where drag is the resistance of an object’s motion through a fluid.