If there was a pendulum swinging back and forth and hitting a metal object, is there a way to create a circuit that would count the swings? In the best, optimal condition, the pendulum would not have any metal on it or anything, but it would touch a metal object. The metal object is directly in the center of the swing back and forth. I can't come up with anything, so if the pendulum was modified to be metal and have a postive charge, the metal object having a negative charge, when they touch, it would complete a ciruit. I just don't know what would be needed to keep count.