CONCEPT MAP

The unit's ideas branch out from one starting point and converge on satellites:

• Planetary Motion (Kepler's Laws) feeds directly into Newton's Law of Gravitation, since Newton derived the inverse-square law from Kepler's third law.
• From Newton's law, one branch develops the field description: Gravitational Field → Superposition → Gravitational Potential Energy → Gravitational Potential.
• A second branch develops Acceleration due to Gravity $g$ → its Altitude, Depth and Latitude variations.
• Both branches converge on Satellites, Energy and Escape Speed (orbital speed, time period, bound energy, escape speed, geostationary/polar satellites, weightlessness). …