Newtons law of gravitation
The force between two point masses is: directly proportional to the product of there masses, inversely proportional to the square of there separation
Force between two point masses is directly proportional to
The product of the masses f directly proportional to Mm
Force between two point masses is inversely proportional to
The square of there seperation (radius), f is directly proportional to 1 over r2
Equation for newtons law of gravitation
Photo
Value of G
6.67 x 10 -11
Keplers first law
The orbit of a planet is an ellipse with the sun at one of the two foci
What is an ellipse
A squashed circle with two foci, all planets orbits are elliptical
Keplers second law
A planet sweeps the same area of the ellipse in a fixed time period as it moves around its orbital path
Understand better
Keplers third law
The square of the orbital period T of a planet is directly proportional to the cube of its average distance r from the sun
Keplers third law equation
