This activity consists of two Parts

Part one: Gravitational force versus distance.

Part two: Gravitational forces versus mass.

To be familiar with the Gravitational force magnitude direction and the parameters affect this force using Phet simulation open the following link and play with it.

https://phet.colorado.edu/sims/html/gravity-force-lab-basics/latest/gravity-force-lab-basics_en.html

Force on mass 2 by mass 1 = 2.9 N Force on mass 1 by mass 2 = 2.9 N 9 6 km Cape mass 1 mass 2 Mass 1 Mass 2 V Force Values Distance billion kg billion kg Constant Size Gravity Force Lab: Basics PRET