Question

1. Why do we sink when we step on one leg in sand?
2. Why do ink pens only work when we apply pressure?
3. How do dams resist the pressure of water?
4. A door will not move, if we apply force in the direction of the arm length. Why?​

Answer 1

Answer:

this is all due to the pressure

Answer 2

Answer:

1)moist sand is lighter then our body.

2)pens will not work in air if we apply pressure the surface rub with pen's tip and contact between them exist and if we apply pressure then with friction surface rub with each other and ink particles flow.

3)if we see dame are thicker at bottom then upper,as pressure of water will be applied below.

4) ...