Physics · Class 11 · Chapter 7
Gravitation
11 lessons98 min7 simulations10 practice questions
One force pulls a mango off its branch and holds the Moon in its orbit. This chapter starts from Kepler's three laws of planetary motion, arrives at Newton's inverse-square law of gravitation, measures G, and then uses the law to find g at any height or depth, gravitational potential energy, the escape speed, and the speed, period and energy of a satellite.
Also called: gravity · Kepler's laws · escape velocity · satellites
Lessons
11 lessons · 98 min
01Kepler's lawsNCERT §7.1, §7.26 min02The law of areasNCERT §7.29 min1 sim03Universal law of gravitationNCERT §7.39 min1 sim04The gravitational constantNCERT §7.46 min05Acceleration due to gravityNCERT §7.59 min1 sim06g above and below the surfaceNCERT §7.610 min1 sim07Gravitational potential energyNCERT §7.76 min08Escape speedNCERT §7.89 min1 sim09Earth satellitesNCERT §7.913 min2 sims10Energy of an orbiting satelliteNCERT §7.106 min11Chapter reviewMust-know facts, traps and formulas15 min
Simulations
7 in this chapter
Equal areas in equal timesIn: The law of areasWhere the pulls cancelIn: Universal law of gravitationBuild a planetIn: Acceleration due to gravityg inside and outside the earthIn: g above and below the surfaceClimbing out of a gravity wellIn: Escape speedLaunch speed: fall, orbit or escapeIn: Earth satellitesSatellite dashboardIn: Earth satellites