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btw, have you never seen people Sorbing?
Quote from: sophiecentaur on 22/03/2009 20:19:10btw, have you never seen people Sorbing?Like Liza it's with a "zee" ... ...sorry, you cannot view external links. To see them, please
REGISTER or LOGINThey throw a bucket of water* in the Zorb with the passengers: it must be like being in a washing machine.[* Maybe this preemptive soaking is to make washing the vomit out easier]
I don’t agree with the mud though, nothing dripped off when I did a little simulation with a thick knife aka ring.
Dewed grass won’t touch the mesh either as it is too short,
Somebody told me my rolling resistance should be orientated in the opposite direction acting from the bottom of the wheel in order not to contribute to the rotation of the wheel. I find this very confusing;...sorry, you cannot view external links. To see them, please
REGISTER or LOGIN-> Here the formulas are completely different (no rolling resistance coefficient) and there’s no deformation.
I think the confusion may arise because of Newton's Third Law and the need to choose the appropriate "action" or "reaction" force.
If the wheel was on a hard surface, (human-hamsterwheel isn't), the only "resistance" to rotation is from its moment of inertia.
sophiecentaur: Thanks for your diagrams! Assuming your last diagram is the correct one, how would you calculate where the origin of the rolling resistance force is?Continuing the quote from the guy at Physicsforums: “The rolling resistance force is (mw + mp)*g. The rolling resistance moment is (mw + mp)*g*b. If you compute a horizontal force couple at the wheel centre and ground necessary to overcome this rolling resistance moment, then the force is F = [(mw + mp)*g*b]/r, pointing forward at the wheel centre, and backward at the ground.”
RD: So playgrounds and gyms are for torture and punishment?