I am studying the effect of dragging different sports cleats on grass and dirt, to find out the amount of traction each have.
I still need more information on how to find the traction. I was also wondering if wearing the cleats would make it easier for finding the traction, rather than just dragging?
Please reply if you can help me with these concerns or you have any other information that you think would be useful for my research.
Traction of sports cleats
Moderators: AmyCowen, kgudger, bfinio, MadelineB, Moderators
-
- Former Expert
- Posts: 289
- Joined: Mon May 05, 2008 10:34 am
- Occupation: graduate student
- Project Question: n/a
- Project Due Date: n/a
- Project Status: Not applicable
Re: Traction of sports cleats
Hi Dice,
I moved your topic to the physical sciences forum where more experts will see it.
Have you started your background investigation? One really important concept in understanding traction is friction. These Wikipedia articles should be good starting places, but you might want to look up some of the references cited and put some of the terms into a search engine as well:
http://en.wikipedia.org/wiki/Traction_%28engineering%29
http://en.wikipedia.org/wiki/Friction
Your intuition that it matters whether you're wearing the shoe or not is absolutely correct. The maximum frictional force between two surfaces (the force that would prevent the shoe from slipping sideways) depends on the 'normal force' pressing them together (your weight pressing the shoe into the ground). This is the same reason that it's harder to slide a couch across the floor if people are sitting on it. If you test the traction of different kinds of shoes, the normal force will probably be something you want as a constant or control variable:
http://www.sciencebuddies.com/science-f ... bles.shtml
These project descriptions have some ideas to get you started on thinking about how to test the traction/friction:
https://www.sciencebuddies.org/science- ... p022.shtml
https://www.sciencebuddies.org/science- ... p013.shtml
http://www.scire.com/sds/Pages/trctact.html (looks like this requires some specialized equipment, but the ideas might be helpful)
Amanda
I moved your topic to the physical sciences forum where more experts will see it.
Have you started your background investigation? One really important concept in understanding traction is friction. These Wikipedia articles should be good starting places, but you might want to look up some of the references cited and put some of the terms into a search engine as well:
http://en.wikipedia.org/wiki/Traction_%28engineering%29
http://en.wikipedia.org/wiki/Friction
Your intuition that it matters whether you're wearing the shoe or not is absolutely correct. The maximum frictional force between two surfaces (the force that would prevent the shoe from slipping sideways) depends on the 'normal force' pressing them together (your weight pressing the shoe into the ground). This is the same reason that it's harder to slide a couch across the floor if people are sitting on it. If you test the traction of different kinds of shoes, the normal force will probably be something you want as a constant or control variable:
http://www.sciencebuddies.com/science-f ... bles.shtml
These project descriptions have some ideas to get you started on thinking about how to test the traction/friction:
https://www.sciencebuddies.org/science- ... p022.shtml
https://www.sciencebuddies.org/science- ... p013.shtml
http://www.scire.com/sds/Pages/trctact.html (looks like this requires some specialized equipment, but the ideas might be helpful)
Amanda
-
- Former Expert
- Posts: 1297
- Joined: Mon Oct 16, 2006 11:47 am
Re: Traction of sports cleats
When it comes to cleats or anything that is designed to tear a surface instead of sliding over it, the properties of the surface can dramatically affect your result.
For example, if you just layed some sod that hasn't had time for the roots to grow into the soil it is sitting on, the break away point could easily be the slipping of the sod on the ground instead of the cleat tearing the grass mat. Different grasses have different growth behaviors that also may affect the outcome. Cleat design 1 might behave better on blue grass than cleat design 2 which might outperform on St. Agustine better than cleat design 1.
For example, if you just layed some sod that hasn't had time for the roots to grow into the soil it is sitting on, the break away point could easily be the slipping of the sod on the ground instead of the cleat tearing the grass mat. Different grasses have different growth behaviors that also may affect the outcome. Cleat design 1 might behave better on blue grass than cleat design 2 which might outperform on St. Agustine better than cleat design 1.
-Craig
-
- Posts: 2
- Joined: Sat Oct 30, 2010 2:43 pm
- Occupation: student
- Project Question: What does more traction cause on sports cleats?
- Project Due Date: December
- Project Status: I am conducting my research
Re: Traction of sports cleats
Thanks! This will really help me in my research.
Dice
Dice
-
- Former Expert
- Posts: 89
- Joined: Wed Aug 31, 2005 6:58 pm
Re: Traction of sports cleats
The shoe cleat to grass interface has an analog in the railroad industry too. Consider a moving train when the brakes are applied, the train then applies a horizontal force to the track in an effort to slow down. What keeps the track from sliding across the sufrace of the earth? It is the attachment of the rails to the ties, rail clips that keep the rails from sliding across the ties, and the ballast, which locks the ties to the ground.
The next time you have a chance to look at track made for freight trains, look at the bottom edge of the rails and look for clips that bear against the sides of the ties. There is usually one clip every second or third tie in both directions. Think of them as train cleats.
Bob
The next time you have a chance to look at track made for freight trains, look at the bottom edge of the rails and look for clips that bear against the sides of the ties. There is usually one clip every second or third tie in both directions. Think of them as train cleats.
Bob