What do we call the gravitational force between the earth and an object?

What is the magnitude of the gravitational force between the earth and a $1 \,kg$ object on its surface (in $,N$)? (Mass of the earth is $6 \times 10^{24} \,kg$ and radius of the earth is $6.4 \times 10^6 \,m$.)

The volume of a $500\, g$ sealed packet is $350\, cm^3$. Will the packet float or sink in water if the density of water is $1\, g\, cm^{-3}$? What will be the mass of the water displaced by this packet?

What happens to the force between two objects,if
$(i)$ the mass of one object is doubled?
$(ii)$ the distance between the objects is doubled and tripled?
$(iii)$ the masses of both objects are doubled?

$A$ stone is released from the top of a tower of height $19.6\, m$. Calculate its final velocity just before touching the ground. (in $, ms^{-1}$)

What do you mean by buoyancy?