physics·NCERT Class 11·Gravitation
Orbits & Gravitation
Medium+80 XP
The ISS orbits Earth every 90 minutes. Astronauts feel weightless — but gravity is still pulling them. They're just in free fall! Set a satellite's altitude and see.
›Orbital velocity: v_o = √(GM/r); escape velocity: v_e = √(2GM/r) = √2 × v_o.
›Kepler's third law: T² ∝ r³.