Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 172
Fig. 151). Friction in bearings(1) Cominou beariug; (_) ball bearing of iron on iron. This means that a pull of 1 jwund will keep a 500-pound car in motion. Sliding friction is not, however, entirely dis-pensed with in ordinaiy wheels, for although the rim of the wheel rollson the track, the axle…
Physics
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