Mechanics:
Greek Waiter

PIRA Class: Non-PIRA

Purpose:
A twist on the pail of water demo, similar to the Gravitron carnival ride.

Description: 

Fill a cup 2/3 full with water and place it in the center of the tray. Use the hook to hold the tray and spin it quickly in vertical, horizontal, or angle circles without the cup falling off or water spilling out of the cup.

The normal force exerted by the tray keeps the cup moving in a circle. The large normal force results in a large frictional force sufficient to hold the cup up against gravity when moving in a horizontal circle.

Equipment:
Greek waiter tray, cup

Location:
Shelf 166 (tray), cups are in the cabinet across from PHYS-102.

Extras:
Instructions for students to make their own tray at home