Tuesday, November 23, 2010

Rotate/Revolve Model

Make this simple model to demonstrate the differences between rotation and revolution.

Thread a practice golf ball onto a pipe cleaner.  Twist the pipe cleaner closed, to make a loop. 

To show rotation: spin the ball.

To show revolution: slide the ball around the pipe cleaner.

The materials are so simple and inexpensive, you could make a classroom set of these and have students try it out themselves.  

You can make a larger scale model using a hula hoop and a wiffle ball.  You will have to cut part of the ball open to get it around the hula hoop. 

1 comment:

  1. Wow, I like this. It is so simple, but yet it clearly show the difference between the two ideas. Great job.