_rolling_doc_ - Which direction is the friction force(1(2(3...

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(a) A wheel slides across a frictionless icy surface with ± >vr. The wheel leaves the ice, and slides over a region with very high friction.
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Unformatted text preview: Which direction is the friction force? (1) (2) (3) other (4) The friction force is zero. (b) Same problem, but this time with ± <vr....
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