Gravitation
Chapter 9 of the Class 9 NCERT Science textbook moves from falling apples to orbiting moons under one universal law. Learners state gravitation mathematically, distinguish the constant governing all masses from acceleration due to gravity, and trace free fall through equations of motion. Mass and weight are carefully separated, and thrust, pressure, buoyancy and Archimedes principle explain floating, sinking and apparent loss of weight. Tides, orbits and weighing with spring balances connect the cosmic law to daily experience.
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