Title Chapter_10A_Gravitation.pptx ✅

GRAVITATION Why are they racing towards the earth…? Its Gravity..!!! Can you imagine skipping without gravity Even a simple task like drinking water would become difficult without gravity.

NEWTON’S LAW OF GRAVITATION m1 m2 r Every object in the universe attracts every other object with a force, which is directly proportional to the product of their masses and inversely proportional to the square of distance between their centers . F α m1m2 1 r2 F α m1m2 r2 F α G m1m2 r2 F = Where G is universal constant of gravitation ……… (2) ……… (1) ….from (1) and (2) m1 m2 r F F If we put m1 = m2 = 1 and r = 1 G 1 1 12 F = G m1m2 r2 F = G F = Universal constant of gravitation is the force of attraction between two unit masses placed at unit distance apart from each other. A B directly proportional Of one physical quantity increases other physical quantity also increases inversely proportional If one physical quantity increases other physical quantity decreases. Consider two bodies of mass m1 and m2 seperated by a distance r from the line joining the center of the mass Let F be the force acting between two bodies Mass of earth is huge, so person gets attracted to earth In comparison to earth the mass of car is negligible, so force of attraction is also negligible. Hence we do not attract object around us If distance is less force is more If distance is more force of attraction is less.