Gravitation
Madhya Pradesh Board · Class 11 · Physics
Summary of Gravitation for Madhya Pradesh Board Class 11 Physics. Key concepts, important points, and chapter overview.
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Overview
Gravitation explains why bodies fall to Earth, why planets move around the Sun, and why satellites remain in orbit. The chapter builds the idea of gravitational attraction from simple observations to Newton's universal law, then uses it to derive acceleration due to gravity, gravitational potential
Key Concepts
Ptolemy proposed a geocentric model
Ptolemy proposed a geocentric model in which all celestial objects revolved around Earth. Aryabhatta mentioned a heliocentric model with the Sun at th
"All planets move in elliptical orbits
"All planets move in elliptical orbits with the Sun situated at one of the foci". This means planetary paths are ellipses, not perfect circles.
"The line that joins any planet
"The line that joins any planet to the Sun sweeps equal areas in equal intervals of time". This is a consequence of conservation of angular momentum f
"The square of the time period
"The square of the time period of revolution of a planet is proportional to the cube of the semi-major axis of the ellipse traced out by the planet."
"Every body in the universe attracts
"Every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proport
Learning Objectives
- Understand Kepler's laws of planetary motion
- State and use Newton's universal law of gravitation
- Explain the meaning and measurement of the gravitational constant G
- Derive acceleration due to gravity on and below the Earth's surface
- Use gravitational potential energy and gravitational potential correctly
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