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Zotrvačníkové koleso, ktoré má spolu s hriadeľom moment zotrvačnosti 200 kg.m2 vzhľadom na os otáčania, sa otáča tak, že koná 180 otáčok za minútu. Vplyvom trenia v ložiskách sa koleso zastaví za dve minúty od okamihu, ako prestali pôsobiť vonkajšie sily svojím otáčavým momentom. Aký je moment síl trenia za predpokladu, že je konštantný? [ 31,4 N.m ]
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