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 extraída pela travagem. Pode ser considerado desgaste dos freios - um par de pastilhas de freio a disco de bicicleta padrão dura cerca de 50 MJ, para carros cerca de 5 GJ.
Power exerted during activity, due to drag forces, altitude change, etc. Negative means power gain, e.g. when going downhill or braking. When in kcal/h or kJ/h, it also takes efficiency and BMR into account.
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