1D50.10-Ball on String


Video: Watch this demo | Demo #2

Outside Video Link

Description: A simple ball on a string to show uniform circular motion wherein the centripetal force is provided by the tension in the string.


  • Tennis ball (or some other ball)
  • String

Setup Procedure: (To make a new ball on string with a tennis ball)

  1. Poke a small hole in the tennis ball.
  2. Tie a knot on the end of a string.
  3. Force the knot into the hole in the tennis ball.

Demonstration Procedure:

  1. Swing the ball around your head, vertically or horizontally.