To increase machine efficiency, reducing friction is the most effective method as it minimizes energy loss. Friction opposes motion and converting input energy to useful work is essential for efficiency. Other options like decreasing force or distance do not directly improve efficiency. ;
To increase machine efficiency, reducing friction is the most effective method, as it minimizes energy loss that occurs during operation. This allows more input energy to be used for useful work. The other options provided do not effectively improve efficiency.
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