19-11-2011, 13:07
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systems engineer (retired)
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Join Date: Nov 2009
Rookie Year: 1969
Location: US
Posts: 8,042
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Re: Physics Quiz 2
Quote:
Originally Posted by SavtaKenneth
we know that when the system is static the force that the wheel exerts on the surface is F = τ/(rsinθ). The minimum force for the wheel to start spinning is F = τ/(rsinθ) > W*mu_s.
and so we get
tau_s > W*mu_s*r*sinθ
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Correct. Now look at Quiz 3.
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