Stable, Unstable, and Neutral Equilibrium

• 1J20.05 - Gömböc - Stable and Unstable Equilibrium
• 1J20.10 - Stable, Unstable, and Neutral Equilibrium
• 1J20.30 - Sky Hook
• 1J20.31 - Hinged Stick Paradox
• 1J20.32 - Hang Spoon on Nose
• 1J20.35 - Bird, Plane, and Circus Clown
• 1J20.60 - Wine Butler
• 1J20.65 - Balancing Soda Can
• 1J20.70 - Rolling Uphill
• 1J20.80 - Rolling Cylinders - Train Wheels Rims