The force of friction is measured in newtons/kg and acts between two surfaces that are in contact/not in contact. you can reduce t

By Ava

The force of friction is measured in newtons/kg and acts between two surfaces that are in contact/not in contact. you can reduce the friction between two surfaces by using streamlining/lubrication.
The direction that friction act is always same as/opposite to the direction of motion of the object​

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