Why a perpetual magnet engines do not work?

Question

A sample of this motor:

[https://www.youtube.com/watch?v=LXBYMiNH1nE](https://www.youtube.com/watch?v=LXBYMiNH1nE)

In: 87

Answer 1

In short, friction and other forces require energy to overcome. As energy is lost to these, the motor loses energy (slows down) until it reaches a point of equilibrium, a spot where all the forces on the motor are equal and the motor stops.