Question

Why is it difficult for us to walk on sand

Answer 1

Well when you walk on say a road you apply some force by your feet on the road and since the road remains stationary it is able to provide a reactionary force to your feet which is extremely essential for walking. ... Therefore it is difficult to walk on sand

Answer 2

it is difficult to walk on sand as sand has many irregularities and when out foot gets in contact with it , both the irregularities gets tangled and it is not easy to walk on an irregular surface such as sand , etc..............