Couldn’t we just apply a magnetic force to the spinning wheel to slow it down?
In: Physics
It’s called regenerative braking, and it’s used in electric and hybrid vehicles. The electric motor can also act as a generator, recharging the battery. This causes eddy currents that can provide a lot of braking resistance. You don’t want to rely on this to stop a car, because it can’t. The slower you go, the weaker the effect, so you still need a clamping force to bring the car to a complete stop.
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