Mechanics:
Trick Briefcase

PIRA Class: 1Q50.40

Purpose:
To demonstrate how conservation of angular momentum can make it difficult to rotate an object.

Description:
A briefcase with a bike wheel hidden inside. Start the wheel spinning then hand the briefcase to someone and ask them to rotate the briefcase in their hand.

NOTE: The small mass of the wheel and the difficulty in getting in spinning quickly makes it difficult to feel a large effect. To the right is a video showing the desired result (skip to 2:07 in the video).

Equipment:
Trick briefcase

Location:
Shelf 143