PHYSICS   LECTURE   DEMONSTRATIONS

M-R7   :   Balls in Grooves

UNIT: Rolling
PURPOSE: Interesting example of rolling with the variable relationship between vcm and angular velocity
EQUIPMENT:
1. Inclined plane with equal grooves
2. Inclined plane with unequal grooves
3. Metal balls of varied radiuses
SUGGESTIONS: Set up races and ask for predictions of results: 
1. Two identical balls, different width groves
2. Two different balls, same width grooves
3. Different balls, different grooves (can achieve equal vcm!)
DISCUSSION: Requires a careful force diagram in solving!

1.                                            2.
 

      3.                                4.                      5.
  



1. Set-up with the three groove board
2. Three identical balls to be released in grooves of various widths
3. Race in progress
4. Two balls of different radius neck-to-neck in grooves of different width
5. Two balls of different radius are ready for release in grooves of equal width