Which of the following decreases friction?

Spikes on shoes

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Rubbing hands with soil

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Treading of tyres

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Powdering a carrom board

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Solution

The correct option is D Powdering a carrom board
Sports persons wear spiked shoes because they dig into the ground and offer a much greater frictional force.
The treaded tyres of cars provide better grip with the ground by increasing the friction between the tyre and the ground.
Kabaddi players rub their hands with soil for a better grip of their opponents. This is again achieved due to increased friction.
Sprinkling powder on carrom board reduces friction. This makes the motion of coins smoother on the carrom board.

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