Code: 1F20.10
Demo Title: Inertia Balls
Subject: Inertia of Rest
Description: Two identical heavy balls on stings pulled at different speeds; If the rod is pulled down slowly, the top thread will break first. If it is pulled down quickly, the bottom thread will break first. When you pull the string slowly the top string feels the weight of the ball, but when you pull fast the balls inertia doesn't allow the force to translate up to the stop string, breaking the bottom string.
Procedure: