A brake is a device that decelerates a moving object such as a machine or vehicle by converting its kinetic energy into another form of energy, or a device which prevents an object from accelerating. Most commonly brakes use friction convert kinetic energy into heat, but in regenerative braking much of the energy is converted instead into useful electrical energy or potential energy (in the form of pressurized air). Since kinetic energy increases quadratically with velocity (K=mv^2/2), an objec… (More on Brake)