A guillotine is a medieval weapon used for public execution of prisoners. the way that a guillotine works is a blade attached to two parallel tracks drops onto a persons neck, displacing their head from their body. the blade of a guillotine has potential energy when it is at the top of the tracks. that potential energy is converted into kinetic energy when the blade is dropped. the blade is able to separate a human head from a body because it has a lot of energy. normally, guillotine blades are very heavy. this enables them to have a lot more gravitational potential energy because Ug=mgh. a more massive blade also means more force on the neck. this is because F=ma.