PIRA Classification: 3A40.10
Description: A mass on a spring and a rotating disc with a ball on its edge are projected onto the side wall of the lecture hall with a bright light source. The disc is set into motion and the hanging mass is released at the moment the ball is at its lowest point.
Special Instructions: Pull down the mass and release when the ball is at its lowest point.
Condition: Ok. The motor control can be touchy.
Setup time: 5 minutes
Safety Issues: None