|
Size: 1160
Comment:
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Size: 1812
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 15: | Line 15: |
| Drop a bounce ball and a non-bounce ball. | Drop a bouncy ball and a non-bouncy ball. |
| Line 22: | Line 22: |
| '''Setup:''' | '''Setup and Procedure:''' |
| Line 24: | Line 24: |
| 1. Set balls in tray to held until use. | 1. Set balls in tray to be held until use. 1. Drop the balls simultaneously from some arbitrary height. One ball will bounce (the happy ball) and the other won't (the sad ball). |
| Line 32: | Line 33: |
| Drop balls simultaneously from some height and observe that one bounces (happy ball) and one doesn't (sad ball). This demonstrates the difference between elastic and inelastic collisions. | At the moment just before impact, each ball has its own momentum. Upon collision with the ground, the nature of the momentum transfer will depend on the material from which each ball is made. If the ball allows for an elastic collision (the happy ball), the ball will bounce upward to the same height it was dropped (ideal case). If the ball allows for an inelastic collision, all of the momentum of the ball will be transferred to the ground. This demonstrates the difference between elastic and inelastic collisions. |
| Line 36: | Line 37: |
| 1. N/A | * [http://hyperphysics.phy-astr.gsu.edu/hbase/elacol.html Elastic & Inelastic Collisions - Hyperphysics] * [https://en.wikipedia.org/wiki/Collision Collisions - Wikipedia] |
[:PiraScheme#Mechanics: Table of Mechanics Demonstration] |
[:MEEquipmentList: List of Mechanics Equipment & Supplies] |
[:Demonstrations:Lecture Demonstrations] |
Happy and Sad Balls, 1R40.30
Location:
Cabinet: [:MechanicsCabinet:Mechanic (ME)]
Bay: [:MechanicsCabinetBayA2:(A2)]
Shelf: #2
attachment:HappySadBalls-400.jpg
Description:
Drop a bouncy ball and a non-bouncy ball.
Equipment |
Location |
ID Number |
|
|
|
Happy and Sad Balls |
ME, Bay A2, Shelf #2 |
1R40.30 |
Setup and Procedure:
- Set balls in tray to be held until use.
- Drop the balls simultaneously from some arbitrary height. One ball will bounce (the happy ball) and the other won't (the sad ball).
Cautions, Warnings, or Safety Concerns:
- Do NOT put in liquid nitrogen!
Demonstration:
At the moment just before impact, each ball has its own momentum. Upon collision with the ground, the nature of the momentum transfer will depend on the material from which each ball is made. If the ball allows for an elastic collision (the happy ball), the ball will bounce upward to the same height it was dropped (ideal case). If the ball allows for an inelastic collision, all of the momentum of the ball will be transferred to the ground. This demonstrates the difference between elastic and inelastic collisions.
References:
[http://hyperphysics.phy-astr.gsu.edu/hbase/elacol.html Elastic & Inelastic Collisions - Hyperphysics]
[https://en.wikipedia.org/wiki/Collision Collisions - Wikipedia]
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