1. subject to the power to go against resistance such as aircraft fuel must be used in clear air of stiffness, especially at high. The more we consume, the more friction, more oil. Another example is that we have to use the hammer and nail to hit a nail to obliterate stiffness.2. the friction causes heat and therefore need to be cooled to prevent burns or broken equipment.3. we need to try to reduce the friction by lubricating parts to use or move easily.4. friction performance of the engine to work decreased.
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