PhET Interactive Simulation Spoken Tutorials-Assignments Funded by the Pandit Madan Mohan Malaviya National Mission on Teachers and Teaching and National Mission on Education through ICT --------------------------------------------------------------------------------- Assignment 1 As an assignment, 1. Using Model screen, Explore earth, moon and earth, satellite systems. Assignment 2 1. Using To Scale screen, Determine the gravitational force between Earth and satellite. Assignment 3 1. Select various systems and observe the orbits. 2. Change the Initial settings and observe the changes in the orbits. 3. Explain the observation.