A Demo for Circular Motion

This is an Instructable on how to demonstrate that circular motion requires the application of a constant force directed toward the center of the circle, and the vectors that accompany that motion.  First we create the apparatus to demonstrate the principle, then, we will discuss how it is to be used.

Step 1

Supplies:
A rubber ball (a high bouncing ball works too, get a large one)
A thick string, 3 or 4 feet long
A size E crochet hook
A pair of pliers
Scissors
Candle
Matches