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Size: 2131
Comment:
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Size: 2273
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| * '''Bay:''' [:MechanicsCabinetBayA2:(A2)] * '''Shelf:''' #5 |
* '''Bay:''' [:MechanicsCabinetBayA7:(A7)] * '''Shelf:''' #1 |
| Line 22: | Line 22: |
| ||Balls||ME, Bay A2, Shelf #5|| || | ||Basketball||ME, Bay A2, Shelf #5|| || ||Medicine Ball||ME, Bay A1, Shelf #1|| || |
| Line 32: | Line 33: |
| 1. Place the ball with attached stabilizer on the cart. | 1. Place the ball with attached stabilizer (ie, large washer) on the cart. |
| Line 41: | Line 42: |
| As per Newton's first law, an object at rest tends to stay at rest unless acted upon by another force. This is precisely what happens. When the cart suddenly accelerates forward, the ball "wants" to maintain its position at rest. Thus, the ball flies off the cart in the direction opposite to the carts motion. This can also understood in terms of momentum conservation: there is initially zero momentum in the system so there should be zero momentum after. Thus the faster you accelerate the cart, the higher the speed the ball will have when it rolls backward. | As per Newton's first law, an object at rest tends to stay at rest unless acted upon by another force. This is precisely what happens. When the cart suddenly accelerates forward, the ball "wants" to maintain its current position at rest. Thus, the ball appears to flies off the cart in the direction opposite to the carts motion. In fact, the ball barley moves relative to the floor. This can also understood in terms of momentum conservation: there is initially zero momentum in the system so there should be zero momentum after. Thus the faster you accelerate the cart, the higher the speed the ball will have when it rolls backward. |
[:PiraScheme#Mechanics: Table of Mechanics Demonstration] |
[:MEEquipmentList: List of Mechanics Equipment & Supplies] |
[:Demonstrations:Lecture Demonstrations] |
Ball on Cart, 1F20.32
Topic and Concept:
Newton's First Law, [:Newtons1STLaw#InertiaofRest: 1F20. Inertia of Rest]
Location:
Cabinet: [:MechanicsCabinet:Mechanic (ME)]
Bay: [:MechanicsCabinetBayA7:(A7)]
Shelf: #1
attachment:BallOnCart03-400.jpg
Abstract:
A ball is placed on a larger cart or dolly. When the larger cart is moved the ball moves in the opposite direction due to the ball's rest inertia.
Equipment |
Location |
ID Number |
|
|
|
Basketball |
ME, Bay A2, Shelf #5 |
|
Medicine Ball |
ME, Bay A1, Shelf #1 |
|
Cart |
Floor Item: Various Locations |
|
Important Setup Notes:
- N/A
Setup and Procedure:
- Place the ball with attached stabilizer (ie, large washer) on the cart.
- Quickly accelerate the cart forward - the ball will roll off in the direction opposite to the carts velocity.
Cautions, Warnings, or Safety Concerns:
- N/A
Discussion:
As per Newton's first law, an object at rest tends to stay at rest unless acted upon by another force. This is precisely what happens. When the cart suddenly accelerates forward, the ball "wants" to maintain its current position at rest. Thus, the ball appears to flies off the cart in the direction opposite to the carts motion. In fact, the ball barley moves relative to the floor. This can also understood in terms of momentum conservation: there is initially zero momentum in the system so there should be zero momentum after. Thus the faster you accelerate the cart, the higher the speed the ball will have when it rolls backward.
attachment:Ball01-250.jpg |
attachment:Ball02-250.jpg |
attachment:Cart01-250.jpg |
attachment:BallOnCart01-250.jpg |
Videos:
[https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]
References:
- N/A
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