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Imagine a bicycle travelling at speed, and then rolling over a log. What are the principles behind calculating the force that is required to roll a wheel over an obstacle?

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closed as off topic by Scott Morrison Jun 18 '10 at 15:50

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As you say in your tag, this is really a physics question, not a mathematical one. – Robin Chapman Jun 12 '10 at 6:27
There's but is has no activity – user6764 Jun 12 '10 at 6:28
Then it's time you created some :-) – Robin Chapman Jun 12 '10 at 6:45
PhysicsOverflow is . It seems to have just launched and is awaiting its first question. Its FAQ proclaims "No question is too trivial or too "newbie" " (unlike MO :-) ). – Robin Chapman Jun 12 '10 at 9:28
I just tried to post this question for you at PhysicsOverflow. First I failed because I didn't give the question a tag; then I looked for a suitable tag, and found that there were none defined (i.e. no tags at all, suitable or unsuitable); then I tried to create a tag and it wouldn't let me because I'm a new user. So that explains why PhysicsOverflow has no questions then. – TonyK Jun 12 '10 at 10:32