Friction and net forces play a key role in the engine running when a car moves at a constant velocity.
Friction plays a crucial role in why engines continue running when a car moves at a constant velocity on the highway. Despite the net force on the car being zero, the engine needs to overcome frictional forces to maintain the constant velocity. For a car to accelerate, the friction force must be greater than the drag force, providing the necessary net force for acceleration.
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