The pendulum is a neodymium magnet on the head of a bolt, dangling on a one foot aluminium chain. Below, a Hall Effect sensor rests atop an electromagnet — 1″ in diameter, with 6/8″ wire ...

The key interaction is between a permanent magnet mounted to the end of the waving arm/pendulum and a many-turn wire coil attached to the body. As the magnet swings over the coil, its movement ...

Description: The length of a pendulum is shortened in mid swing by the string hitting ... A 1.5 inch diameter wooden ball is suspended by a string from a bar attached to a magnet which sticks to the ...