Table of Mechanics Demonstration

List of Mechanics Equipment & Supplies

Lecture Demonstrations

Ball on a String, 1D50.10

Topic and Concept:

pira200 Listed




A tennis ball tied to a sting is whirled around in a vertical circle by hand.



ID Number

Tennis Ball w/Attached String (2)

ME, Bay A2, Shelf #1

Also can be found with in room tact cabinet

Important Setup Notes:

Setup and Procedure:

  1. Hold the string in hand securely.
  2. Swing the ball into a circular trajectory.

Cautions, Warnings, or Safety Concerns:


When swinging the ball, which gives it momentum, the ball is unable to travel in a straight line. The string puts a tension on the ball causing it to arc around. In other words, the ball is put into a circular trajectory due to the centripetal force being provided by the tension in the string which is proportional to the tangential speed of the ball. To prove the is a central force to the audience, just simply let go of the string. The ball will then travel tangent to the circular trajectory it was on.




fw: Ball_on_a_String (last edited 2018-07-18 16:23:48 by srnarf)