This is one of my favorite demos. Easy to do and doesn't really require any equipment. The basic idea is that you support a meter stick horizontally with two fingers. Slide your fingers in and they ...

Equipment: A meter stick, a 200 gram weight, a plexiglas cylinder and a cork covered piece of wood. Optional: an 8 foot length of 2" x 2" and a 1 kg weight. What it does: A meter stick is supported on ...