Why is it painful to walk barefooted on a road covered with pebbles having sharp edges?  

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It is painful to walk bare – footed on a road covered with pebbles having sharp edges because they have small area and since: Pressure = force/Arer,  Area is less i.e. pressure is more. It Means out feet exert greater pressure on pebbles and in turn pebbles exert equal reaction on the feet.

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