why is it more easier to walk on hard ground than on sand?

Question

physics

Answer 1

sand is not very hard or rigid.but the hard ground exerts a forward reaction on your feet when you exert a backward force on the road.(every action has an equal and opposite reaction)

Answer 2

It's easier because your foot doesn't sink into the hard ground. When you push off again, there is more resistance from the hard ground than from the sand.

"More easier" is redundant. Use "easier".

Answer 3

When we walk, the supporting ground provides a normal reaction to support our weight. The sand is not enough rigid because it collapses below the force required to support us.

Answer 4

Ground is solid, almost unmoving, and it pushes up more on your feet when you walk.
Sand, however, gives. Your foot sinks in it. That is why it is difficult.