Question

we apply oil in machine to _ friction​

Answer 1

$\huge\mathfrak\red{ANSWER}$

Applying oil to the moving part of machine is to reduce its friction while having movement against each other.

EXPLANATION

The continuous movement between two parts which are connected with some joint produces heat energy due to the friction which act against each other

Answer 2

Answer:

we apply on to machine to reduce friction

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reduce is correct answer