Physics
Gravitation: Chapter Guide and Key Ideas
By Dr. Sandhya Classes Editorial Team · Published 2026-10-03 · Updated 2026-10-03 · 3 min read
Kepler's laws, gravitational field, potential and satellite motion explained simply.
Physics at Dr. Sandhya Classes is taught personally by Dr. Sandhya, Ph.D. in Physics, teaching since 2015 — offline in Zirakpur (Highland Marg & Lohgarh Road) and online across India. About Dr. Sandhya
Universal law of gravitation
Every mass attracts every other mass with a force proportional to the product of masses and inversely proportional to the square of distance.
Field and potential
The field tells the force per unit mass; potential tells the energy per unit mass. Keep their signs and graphs clear.
Satellites and escape velocity
Orbital speed comes from balancing gravity with the needed centripetal force; escape speed from energy conservation.
Variation of g
g changes with height, depth and latitude — a frequent source of short questions.
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