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Re: Cordless drills
My understanding is that many have a mechanical brake that engages when the drill is stopped. Some newer drills also have electric brakes that slow down the chuck using the energy from the deceleration of the chuck (I forget exactly how they work). The E-brakes don't continue braking after the drill stops where as the mechanical brakes do. Look on youtube for some videos with people disassembling drills.
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