#acl snarf:read,write,delete,revert,admin FacultyGroup:read,write All:read
||<30%  style="text-align:center">[[PiraScheme#Mechanics|Table of Mechanics Demonstration]] ||<30%  style="text-align:center">[[MEEquipmentList|List of Mechanics Equipment & Supplies]] ||<30%  style="text-align:center">[[Demonstrations|Lecture Demonstrations]] ||


= Ball on a String, 1D50.10 =
'''Topic and Concept:'''

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

'''pira200 Listed'''

'''Location:'''

 * '''Cabinet:''' [[MechanicsCabinet|Mechanic (ME)]]
 * '''Bay:''' [[MechanicsCabinetBayA2|(A2)]]
 * '''Shelf:''' #1

{{attachment:Ball03-400.jpg}}

'''Abstract:'''

A tennis ball tied to a sting is whirled around in a vertical circle by hand.
||<40%  style="&quot; ;text-align:center">'''Equipment''' ||<30%  style="text-align:center">'''Location''' ||<25%  style="text-align:center">'''ID Number''' ||
|| || || ||
||Tennis Ball w/Attached String (2) ||ME, Bay A2, Shelf #1 || ||
||||||<style="text-align:center">Also can be found with in room tact cabinet ||




'''''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:'''

 1. Hold the string in hand securely.
 1. 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:'''

 * [[https://www.youtube.com/user/LectureDemostrations/videos?view=1|Lecture Demonstration's Youtube Channel]]

'''References:'''

 * [[https://en.wikipedia.org/wiki/Central_force|Central Forces - Wikipedia]]
 * [[https://en.wikipedia.org/wiki/Centripetal_force|Centripetal Force - Wikipedia]]

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