The magnitude of the force of gravity acting between the particles is:
[tex]F=G\frac{m_1.m_2}{d^2}[/tex]
The weight of each particle is:
[tex]P=mg[/tex]
Now let's plug in the numbers knowing that [tex]G=6.67\times10^{-11}[/tex] , [tex]g=9.81[/tex], [tex]d=0.8[/tex] and m1 and m2 are already given in kilograms. We get then:
[tex]P_1=m_1.g=78.48[/tex]N
[tex]P_2=m_2.g=117.72[/tex]N
[tex]F=G\frac{m_1.m_2}{d^2}=1.00\times10^{-8}[/tex]N
This results shows us why we don't often see objects being attracted to each other, their mass is too small compared to the earth gravitational pull.
