Question
When you stand on the sand, your feet sink deeper into it, but when you lie down, your body sinks less into the sand, why?
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Answer
In standing position the area is less but when you lie down the area is more. Whereas in both the cases the weight force is the same. Therefore, in the lying position the body sinks less due to less pressure $P = F/A$ as compared to the standing positon.
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