Question

Why its safe to jump on sand rather than a cement floor?

Answer 1

this is so because In the case of jumping on sand, the feet penetrates deep into the sand so that it exerts less force on the sand.... As a result, sand also exert less force only on the feet according to Newton's law.... In the case of concrete surface, the feet can't penetrate into the surface since the surface is rigid..So, the feet applies more force on the surface and as a result the concrete surface also exert an equal amount of force which is large enough to hurt more on the feet.

Answer 2

Its safe to jump on sand rather than a cement floor because sand has a smooth surface in which it is safe to jump over but cement is very hard if jumped on it serious injuries may occur.
Hope it will help.......