Tuesday, November 23, 2010
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.