Gravitation

Why do camels have broad feet and why do humans tend to sink in sand while camels do not?

Why does an iron rod sink in water while a ship made of iron floats on water?

Why does a cork float on water but sink in oil?

Why is it easier to swim in sea water than in river water?

Why are knives sharp?

What are the uses of lactometer and hydrometer?

What are fluid, What is Archimedes principle and What are its applications?

While swimming why do we feel light?

Define Archimedes principle.