Rotating Water Bucket

Purpose

To illustrate dramatically centripetal force and centrifugal reaction.

Equipment

Bucket with water.

Images

d1-41

Description

Put some water in the bucket and rotate the bucket in a vertical circle over your head. The centripetal force provided by your arm keeps the water bucket moving in a circle, while the centrifugal reaction keeps the water in the bottom of the bucket, as long as the rotational velocity is sufficient.