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Physics, 29.11.2019 23:31 ghst

An old door is very hard to open until oil is sprayed on its hinges. what does the oils do?
a)it increases the force of friction
b)it increases the force of gravity
c) it reduces the force of gravity
d)it reduces the force of friction

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An old door is very hard to open until oil is sprayed on its hinges. what does the oils do?
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