Why does a block of wood held under water rise to the surface when released?

What is the mass of 5 m³ of cement of density 3000 kg/m³?

What is the density of a substance of mass 100 g and volume 10 cm³?

The density of a body is 800 kg/m³. Will sink or float when dipped in a bucket of water? (Density of water = 1000 kg/m³).

Fill in the blanks with suitable words:

(a) Force acting on a unit area is called ………..

(b) It is the ……… force which makes objects appear lighter in water.

(c) A heavy ship floats in water because its ………. Density is less than that of water.

(d) In fluids (liquids and gases), pressure acts in ……..directions, and pressure …………..as the depth increases.

(e) In order to sink in a fluid, the density of an object must be ………. Than the …….. of the fluid.

(f) Snow shoes work by spreading out a person’s ………….. over a much bigger ……..

(g) If the area of a snow shoe is five times ……… than the area of an ordinary shoe, them the pressure of a snow shoe on the snow is five times ………………