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When the ball is swung it is given a momentum. The ball is unable to travel in a straight line, however. The string puts a tension on the ball causing it to arc upward. In other words, the ball is put into a circular trajectory with the centripetal force being provided by the tension in the string which is proportional to the tangential speed of the ball.		 When swinging the ball, which gives it momentum however, 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 let go of the string and the ball will travel tangent to the circular trajectory it was on.

[:PiraScheme#Mechanics: Table of Mechanics Demonstration]

[:MEEquipmentList: List of Mechanics Equipment & Supplies]

[:Demonstrations:Lecture Demonstrations]

Ball on a String, 1D50.10

Topic and Concept:

  • Motion in Two Dimensions, [:MotionIn2D#CentralForces: 1D50. Central Forces]

Location:

attachment:Ball02-400.jpg

Abstract:

A Tennis Ball tied to a sting is whirled around in a vertical circle by hand.

Equipment

Location

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:

  • Please use the Tennis Ball ones only! The brass and would balls, are for hand-held pendulums and can be dents if smacked around.

Setup and Procedure:

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

Cautions, Warnings, or Safety Concerns:

  • N/A

Discussion: When swinging the ball, which gives it momentum however, 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 let go of the string and the ball will travel tangent to the circular trajectory it was on.

attachment:Ball01-250.jpg

attachment:Ball03-250.jpg

Videos:

References:

[:Instructional:Home]

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