The friction will decrease on applying oil on door hinges because:
⇒ When oil is applied between the moving part of a door, a thin layer is formed there.
⇒ Due to which the moving surfaces do not directly rub against each other.
⇒ As a result, friction reduces and the movement of door becomes smooth.
Note: The substances which reduce friction are called lubricants. For example – oil, grease, graphite etc.
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