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Size: 1992
Comment:
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Size: 2113
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 14: | Line 14: |
| attachment:Ball02-400.jpg | attachment:Ball03-400.jpg |
| Line 18: | Line 18: |
| A ball tied to a sting is whirled around in a vertical circle by hand. | A tennis ball tied to a sting is whirled around in a vertical circle by hand. |
| Line 22: | Line 22: |
| ||Ball w/Attached String||ME, Bay A2, Shelf #1|| || ||<:-3>also can be found with in room tack cabinet|| |
||Tennis Ball w/Attached String (2)||ME, Bay A2, Shelf #1|| || ||<:-3>Also can be found with in room tact cabinet|| |
| Line 26: | Line 26: |
| * If using the brass ball, be carefull not to smack it on anything as the ball is hollow and dents easily. | * Please use the Tennis Ball ones only! The brass and wood balls, are for hand-held pendulums and can be dented if smacked around. |
| Line 32: | Line 32: |
| 1. Swing the ball into a circular, vertical trajectory. | 1. Swing the ball into a circular trajectory. |
| Line 39: | Line 39: |
| 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. | |
| Line 40: | Line 41: |
| 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. ||attachment:Ball01-250.jpg||attachment:Ball03-250.jpg|| |
[: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:
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.
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 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 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.
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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