Energy extracted by braking. Can be regarded as brake wear - a pair of standard bicycle disc brake pads will last around 50 MJ, for cars around 5 GJ.
Energia extreta per frenada. Es pot considerar com un desgast dels frens: un parell de pastilles de fre de disc estàndard duraran uns 50 MJ, per a cotxes d'uns 5 GJ.
Purely mechanical work sexpent for this activityded (disregarding thermal efficiency and BMR). For bikes this can be regarded as a measure of chain wear - a standard bicycle chain will last about 100 MJ, for motorcycles about 1 GJ.
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