Which of the following action does not increase friction?

Treading tires

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Applying oil on hands

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Applying soil on hand

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Making spikes on shoes

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Solution

The correct option is B Applying oil on hands
The friction of a surface is increased by increasing its roughness. So, treading and spikes adds to the object's roughness; similarly wrestlers apply soil on their hand to increase friction.
Applying oil on hands fills the small pores on our hand; which makes the hands slippery. This is how it reduces friction.

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