State whether the following statement is True or False:
All objects attract each other along the line joining their centre of mass.

If your weight on the Earth is $450 N$,calculate your weight on planet Mars. (Radius of Mars $= 4.3 \times 10^{6} m$,mass of Mars $= 6 \times 10^{23} kg$ and gravitational constant $G = 6.67 \times 10^{-11} Nm^{2} kg^{-2}$). Take acceleration due to gravity on Earth as $10 m s^{-2}$.

$A$ body of mass $10 \,kg$ is taken to the centre of the earth. What will be its mass there (in $,kg$)?

Do the gravitational forces obey Newton's third law of motion?

Distinguish between mass and weight of an object. How does the weight of an object change when moving from the equator to the poles? When can the weight of an object be zero?

On Earth,how much force is needed to lift an object of mass $100 \,g$ (in $,N$)?