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Size: 1493
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Size: 2567
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 11: | Line 11: |
| * '''Bay:''' [:MechanicsCabinetBayA1:(A1)] * '''Shelf:''' #1,2,3.. |
* '''Cubby:''' (C4) |
| Line 14: | Line 13: |
| attachment: mainPhoto | attachment:PlaneSetup-400.jpg |
| Line 18: | Line 18: |
| An inclined plane is raised until a block starts to slide. | An inclined plane with a block resting on top is raised until the block begins to slide. |
| Line 22: | Line 22: |
| ||apparatus||ME, Bay B1, Shelf #2|| || ||all other parts||ME, Bay B1, Shelf #2|| || ||...||ME, Bay B1, Shelf #2|| || |
||Inclined Plane||ME, Cubby C4|| || ||Block||ME, Cubby C4|| || ||Protractor||ME, || || ||Jack Stand||ME, || || |
| Line 33: | Line 34: |
| 1. List steps for setup then procedure. 1. ... |
1. Set out an inclined plane with the wood block or any other block. 1. Slowly lift by hand or use a jack stand if desired to slowly raise the plane until the block begins to slide down. 1. One can use a protractor to measure the angle of repose if desired. Using the jack stand in step 2 will help the accuracy of this step. |
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| * | * N/A |
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| Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate. | As the angle of plane relative to the table is increased, there is less normal force on the block due to the plane and therefore less static friction between the block and the plane. An added effect is the increasing magnitude of the component of the force of gravity down the plane. The angle of repose is the critical angle where the gravitational force down the plane on the block is just enough to overcome the frictional force. This angle will differ depending on the normal force on the block being used(i.e. it's mass) and the material-dependent interaction between the two surfaces (i.e. the coefficient of static friction of the block). |
| Line 44: | Line 46: |
| ||attachment: photo||attachment: photo||attachment: photo||attachment: photo|| | Note: A free body diagram would be a good tool to describe the forces acting on the block before and after the block starts to slide. attachment:FreeBodyDiagram-250.png ||attachment:IncPlane01-250.jpg||attachment:Platform01-250.jpg||attachment:Protractor02-250.jpg||attachment:Block01-250.jpg|| |
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| * List any references | * [http://simple.wikipedia.org/wiki/Inclined_plane Inclined Plane - Wikipedia] |
[:PiraScheme#Mechanics: Table of Mechanics Demonstration] |
[:MEEquipmentList: List of Mechanics Equipment & Supplies] |
[:Demonstrations:Lecture Demonstrations] |
Angle of Repose, 1K20.35
Topic and Concept:
Applications of Newton's Laws, [:AppNewtonsLaws#Friction: 1K20 Friction]
Location:
Cabinet: [:MechanicsCabinet:Mechanic (ME)]
Cubby: (C4)
attachment:PlaneSetup-400.jpg
Abstract:
An inclined plane with a block resting on top is raised until the block begins to slide.
Equipment |
Location |
ID Number |
|
|
|
Inclined Plane |
ME, Cubby C4 |
|
Block |
ME, Cubby C4 |
|
Protractor |
ME, |
|
Jack Stand |
ME, |
|
Important Setup Notes:
- N/A
Setup and Procedure:
- Set out an inclined plane with the wood block or any other block.
- Slowly lift by hand or use a jack stand if desired to slowly raise the plane until the block begins to slide down.
- One can use a protractor to measure the angle of repose if desired. Using the jack stand in step 2 will help the accuracy of this step.
Cautions, Warnings, or Safety Concerns:
- N/A
Discussion:
As the angle of plane relative to the table is increased, there is less normal force on the block due to the plane and therefore less static friction between the block and the plane. An added effect is the increasing magnitude of the component of the force of gravity down the plane. The angle of repose is the critical angle where the gravitational force down the plane on the block is just enough to overcome the frictional force. This angle will differ depending on the normal force on the block being used(i.e. it's mass) and the material-dependent interaction between the two surfaces (i.e. the coefficient of static friction of the block).
Note: A free body diagram would be a good tool to describe the forces acting on the block before and after the block starts to slide.
attachment:FreeBodyDiagram-250.png
attachment:IncPlane01-250.jpg |
attachment:Platform01-250.jpg |
attachment:Protractor02-250.jpg |
attachment:Block01-250.jpg |
Videos:
[https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]
References:
[http://simple.wikipedia.org/wiki/Inclined_plane Inclined Plane - Wikipedia]
[:Instructional:Home]