Why does a camel walk easily on sand but it is difficult for a man to walk on sand though a camel is much heavier than a man?

It is because camel’s feet have large surface area, the force of their weight is distributed over a large area of sand. The pressure produced on sand is small and hence, a camel’s feet do not sink into the sand. On the other hand, a man’s feet have a small surface area, the force of their weight is distributed over a smaller area of sand. The force per unit area or pressure produced on sand is large in this case due to which a man’s feet sink into sand and it becomes difficult for him to walk on sand.