Question

Why do we get hurt more when we fall on a hard floor than on a sandy floor

Answer 1

Cemented floor is a solid shape but a heap of sand is not. It's like a semi-solid which can change it's shape.

When you're falling, you gain a high amount of momentum.

We know

Force = mass x acceleration = mass x velocity / time = momentum/time.

When we fall on cement, our velocity instantly reduces to 0, so time is very short and thus the force we feel is quite high, according to the above equation. But when we fall on sand[visualize it as a cushion], significantly higher amount of time is taken by the body to come at rest, so, force is decreased.