Dynamic braking is when a machine or vehicle changes energy from kinetic energy (the energy of movement) into heat energy. When a car is slowing down, it uses its brakes to turn kinetic energy into heat energy. This is a way of slowing the car down by changing the energy. In electric machines and vehicles, dynamic braking can be used instead of brakes. The electric motor uses the electromagnetic fields to turn the kinetic energy into heat energy in the motor, helping to slow down the machine or vehicle.