Ball on a String, 1D50.10
Topic and Concept:
Motion in Two Dimensions, 1D50. Central Forces
pira200 Listed
Location:
Cabinet: Mechanic (ME)
Bay: (A2)
Shelf: #1
Abstract:
A tennis ball tied to a sting is whirled around in a vertical circle by hand.
Equipment |
Location |
ID Number |
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|
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Tennis Ball w/Attached String (2) |
ME, Bay A2, Shelf #1 |
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Also can be found with in room tact cabinet |
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Important Setup Notes:
- Please use the Tennis Ball ones only! The brass and wood balls, are for hand-held pendulums and can be dented if smacked around.
Setup and Procedure:
- Hold the string in hand securely.
- Swing the ball into a circular trajectory.
Cautions, Warnings, or Safety Concerns:
- N/A
Discussion:
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.
Videos:
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