Consider the following systems. Create models for them, making sure to draw energy bar charts. Provide equations for energy in symbolic form (if you can). 9. A balloon with charge +q is placed directly above another balloon of charge +q (on the floor). The upper balloon is then released. 10. A charged spherical ball of mass m and charge +q is floating horizontally towards another charged ball of equal mass and opposite charge through a viscous liquid. 11. A mass m with small positive charge +q is placed on the level ground a distance r away from a mass M with a large negative charge -Q and released. (The masses feel kinetic friction with the ground.) 12. A balloon with charge -q is stuck to the wall. The balloon then slides down the wall to the floor.