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Kepler's Laws of Planetary Motion

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Physics Powerpoint Presentation- Keplers laws of planetary motionKendriya Vidyalaya

- JOHANNAS KEPLER - Developed 3 laws that all planets follow while in orbit!
- WARM - UP
- Warm-Up Question Answer…
- Kepler’s First Law The orbit of the planets are ellipses, with the sun at one focus of the ellipse. Draw the sun and Earth and indicate the direction of orbit on your paper.
- Ellipses and Eccentricity The amount of flattening of the ellipse is termed the eccentricity. Circle = 0 Straight Line = 1
- Ellipses The sun is not at the center of the ellipse. There is nothing at the other focus.
- Astronomical Distances An Astronomical Unit (AU) is the average distance between Earth and the Sun. Used when measuring distances to other solar system objects. A Light year is the distance it takes light to travel in 1 year. Used to measure distances to other stars and galaxies.
- Kepler’s Second Law The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse. As the planet approaches the sun… Orbital Speed will Increase Gravitational force will Increases As the planet travels away from the sun… Orbital Speed will decrease Gravitational force will decrease
- Kepler’s Third Law The closer the object is to the Sun the faster its period of revolution. Example: Earth & Mars Orbit
- Get your computer – Log on to our website (orbital motion page) Three links are at the bottom for Kepler’s 1st, 2nd, and 3rd Law