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Why is it difficult to walk on sand? 

P=F/A

Pressure is invesly portiponal to area so,

(1)pressure increses area decrsess or

(2)area increses pressure decreses

area covered by us is very very small so it difficult to walk on sand

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area covered by us very very small so pressure exerted by us is very large  according to fourmula !!!!!!

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here area dcreses and pressure increses

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3rd Law: action/reactionWhen you walk, the reaction force from the substrate (floor, sand, etc.) is what pushes you forward. On sand, the reaction force is divided over many, many small particles, and is scattered into a myriad of directions. This scattering does not leave a lot of reaction force pointed toward your foot, so a lot of your effort is scattered -- that is, lost.

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The main reason it is difficult to walk on sand is because the sand grains are unconsolidated (loose). So with each step you take, you just move the sand grains around (similar to the plastic ball pits that children play in).

In contrast, if you walk on a hard sandstone, the grains are cemented and create a hard surface, so if you walk on solid rock, the grains mostly stay in place. You have a much more stable surface.
 

If you are walking barefoot, you have some more difficulties:

  1. Much of sand is made up of broken quartz, which can be quite abrasive on your skin.
  2. If the weather is hot, the sand can feel very hot!
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