Why is walking barefooted on a sharp gravel (grit) road difficult?
(N/A) Pressure is defined as force per unit area $(P = F/A)$.
When walking barefoot on sharp gravel,the contact area $(A)$ between the feet and the sharp edges of the stones is extremely small.
Since the pressure is inversely proportional to the area $(P \propto 1/A)$,a very small area results in a very high surface pressure.
This high pressure exerted on the skin of the feet causes pain,making it difficult to walk.
When walking barefoot on sharp gravel,the contact area $(A)$ between the feet and the sharp edges of the stones is extremely small.
Since the pressure is inversely proportional to the area $(P \propto 1/A)$,a very small area results in a very high surface pressure.
This high pressure exerted on the skin of the feet causes pain,making it difficult to walk.
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