Quote:
Originally Posted by sofaking
Also, if you'd like to give a physics lesson I'm interested. I've made my point and am fine moving on non-combatively. If you'd like to continue with your point on the forces on a tire please do, I might learn something. I do understand more than you think, and I'm happy to learn more. Having me draw the diagram for your point doesn't make as much sense over the internet as if we were sitting in the same room (so you could more easily correct anything inaccurate), so if you'd like a diagram it probably would make more sense for you to create it.
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The FBD is the basics of understanding an engineering problem. Being only concerned with 2 dimensions right now ensures that mistakes are easy to fix. Wiki has a decent article on it:
http://en.wikipedia.org/wiki/Free_body_diagram