PIRA Classification: 1D55.10
Description: An aluminum ring, with a section removed, is placed on the lecture bench. Line up the circle so the ball will roll parallel to the edge of the bench. Roll a 2 inch steel ball inside of the circle. Ask the class where the ball will go when it reaches the gap.
Special Instructions: Hold the ring securely when rolling the ball. The ring can move easily or deform slightly.
Condition: Good
Setup time: 1 minute
Safety Issues: None