It has enough energy to overcome the frictional resistance in valves and registers.

它有足够的能量克服阀门和记录器的摩擦阻力。

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A discussion is made of the work done by static frictional force and the conservation of mechanical energy in the work doing process by way of typical cases.

本文就静摩擦力做功以及在静摩擦力做功过程中机械能守恒问题，结合实例做进一步讨论。

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During braking, it becomes a generator, recapturing energy normally lost as frictional heat.

ECONOMIST: Fuel economy