Procedure. Use the simulator http://phet.colorado.edu/en/simulation/gravity-force-lab Hit the Run Now! button 1. Take some time and familiarize yourself with the simulation. Notice how forces change as mass changes and as distance changes. 2. Fill out the chart below for various objects at various distances. 3. Solve for the universal gravitation constant, G and compare it to published values. Mass Object 1 Mass Object 2 Distance Force Gravitation Constant, G 56.30 kg 52.20 kg 3.0 m