Whats the theory behind bike skidding on the sand? Is it related to friction and if then why it skids. Is that the sand has more friction if so then pedaling should be difficult rather than skidding.
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$\begingroup$ Why would more friction make pedaling difficult? $\endgroup$– BowlOfRedCommented Jun 29, 2020 at 0:20
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loose sand has no shear strength. This is why bike wheels skid on sand: the sand adheres to the tire, but that sand shears loose from the rest of the sand. Then you fall down go BOOM.
answered Jun 29, 2020 at 2:00