Three Balls Discrepant Event

1Q10.450B | Ad4
Catalog: 
1Q10.450B
Location: 
Ad4
Room: 
PS F175
Condition: 
Good
Quantity: 
1
Setup Time: 
1 hour
  • The three balls roll together.
    The three balls roll together.
  • One ball rolls slower than the other two.
    One ball rolls slower than the other two.
Date Added: 
Thursday, May 31, 2007 - 12:00am
Description: 

Three metal balls roll back and forth. When rolled one way all three balls roll side by side. When rolled the other way one ball rolls ahead of the other two. Students are challenged to explain why.

Instructions: 

place the hollow sphere on the outside and up hill for the first roll reverse and roll the other way.

Purpose: 
To show how the moment of inertia is related to radius, mass and mass distribution.
Parts: 

Four Ball Set (Ae4) Solid steel ball (66 g) Hollow steel ball(21g) Solid Aluminum ball (24g) channel (under stairs)