Have you ever used a table saw? When shut off, the blade doesn't have "low momentum"; if it were clutched, it would still be spinning fast enough to seriously

Have you ever used a table saw? When shut off, the blade doesn't have "low momentum"; if it were clutched, it would still be spinning fast enough to seriously mangle or sever fingers. An active brake won't be fast enough. Remember, each tooth is flying at an insane amount of speed; you need to be able to stop the saw dead in a fraction of the length of the tooth (within the length of about 3/4" - about the thickness of an adult hand/finger). You don't - you can't - do that with a friction brake, or even some hypothetical friction plus e-braking (regenerative braking). That spinning mass of steel has a ton of momentum, even disconnected from the motor. The only way to reliably stop is is to quickly jam something non-yielding into the teeth of the saw. If you can figure out another way, kudos to you! But I would suggest you first learn about what and how a table saw works first, just to know what kind of forces you are dealing with. They are anything but small.