DERIVING KEPLER S LAWS OF PLANETARY MOTION
[Pages:31]DERIVING KEPLER'S LAWS OF PLANETARY
MOTION
By: Emily Davis
WHO IS JOHANNES KEPLER?
German mathematician, physicist, and astronomer
Worked under Tycho Brahe Observation alone Founder of celestial mechanics
WHAT ABOUT ISAAC NEWTON?
"If I have seen further it is by standing on the shoulders of Giants."
Laws of Motion Universal Gravitation Explained Kepler's laws
The laws could be explained mathematically if his laws of motion and universal gravitation were true.
Developed calculus
KEPLER'S LAWS OF PLANETARY MOTION
1. Planets move around the Sun in ellipses, with the Sun at one focus.
2. The line connecting the Sun to a planet sweeps equal areas in equal times.
3. The square of the orbital period of a planet is proportional to the cube of the semimajor axis of the ellipse.
INITIAL VALUES AND EQUATIONS
Unit vectors of polar coordinates (1)
INITIAL VALUES AND EQUATIONS
From (1), (2)
Differentiate with respect to time t (3)
INITIAL VALUES AND EQUATIONS CONTINUED...
Vectors follow the right-hand rule
(8)
INITIAL VALUES AND EQUATIONS CONTINUED...
Force between the sun and a planet (9)
Newton's 2nd law of motion: F=ma
F-force G-universal gravitational
constant M-mass of sun m-mass of planet r-radius from sun to planet
(10)
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