Gravitation

Gravitation

1. Kepler's Laws

   • First law
     • The paths of the planets are ellipses, with the sun at one focus.
   • Second law
     • States that an imaginary line from the sun to a planet sweeps out equal areas in equal time intervals.
   • Third law
     • The square of the ratio of the periods of any two planets revolving around the sun is equal to the cube of the ratio of their average distances from the sun.

2. Gravitational force

   • force attraction between two objects must be proportional to the object's masses.

3. Law of universal gravitation

   • States that objects attract other objects with a force that is proportional to the product of their masses and inversely proportional to the product of their masses and inversely proportional to the square of the distance between them.

4. Period of a planet orbiting the sun

   • Is equal to 2pi times square root of the average distance from the sun cubed, divided by the product of the universal gravitational constant and the mass of the sun.

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