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ARC-Easy / Mercury_7173653 / Machines are often full of moving parts that rub against each other. In…

Problem

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question

Machines are often full of moving parts that rub against each other. In machines, a lubricant such as oil is often applied to these moving parts. Why is this oil necessary?

choices

  • to enhance the effectiveness of friction
  • to increase the efficiency of the machine
  • to provide an additional source of energy
  • to produce more thermal energy on the machine

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