Why does oiling the axles of a bicycle make the bicycle move more easily?

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Solution

By using Lubricants such as oil or grease which reduces the area of contact between the two surfaces, i.e. the axle and wheel; thereby, reducing the friction between the two surfaces. This helps in moving the bicycle more easily.
also
The oiling of the axles of a bicycle is a lubricant process means it reduces the friction and let your bicycle move easily and smoothly.

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