If a car moves consistently at 80 kmh and it weighs at 600kg, is it not generating any force? since you know, a=0, am I stupid or is Newton ?
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A car travelling at some speed is generating forces.
If that speed is unchanging, the sun of the forces are zero.
Take the car example. Drivetrain is pushing the car forwards with some force. The ground is pushing on the car upwards and also sticking to the tires. The air is trying to stay still and the car is pushing through it.
This means the car has to use energy, and thereby force, to maintain its speed. If you think about work being force through a distance, the car is doing work.
But the air, etc is also doing equal and opposite negative work to keep the car from accelerating
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