Kepler’s Laws.

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Presentation transcript:

Kepler’s Laws

Science Starter After reading the article, write one or two paragraphs: What is your opinion on it? What is an “orbit”? Name 2 things that orbit, and tell what they orbit around

HOMEWORK Get progress reports signed No other homework

Standard 1.1.1: KEPLER’S LAWS How do planets move?

WHO IS KEPLER? While watching the video, write down 3 interesting facts about Johannes Kepler Video Link

KEPLER’S LAWS Kepler created 3 laws that discuss how Earth and the other planets move

1ST LAW: LAW OF ELLIPSES Planets move in elliptical orbits with the sun at one focus

WHY AN ELLIPSE?! The shape is determined by 2 focal points The sun has such a large gravitational pull that the sun is at one focus and their other is empty!

ROTATION VS. REVOLUTION spinning orbiting 24 hours 1 year QUICK REVIEW ROTATION VS. REVOLUTION spinning orbiting 24 hours 1 year

2ND LAW: LAW OF EQUAL AREAS Planets speed up when they are closer to the sun because of the sun’s gravitational pull

2ND LAW: LAW OF EQUAL AREAS Which is the faster side?

BARYCENTER Barycenter – the center of mass between 2 points All bodies (including the planets and the sun) revolve around a barycenter

CENTER OF MASS

3RD LAW: LAW OF HARMONIES The time it takes to revolve around the sun is proportional to the distance from the sun The further from the sun, the longer the revolution

JUST LIKE A TRACK!

Plot a graph of the DISTANCE from the SUN (on the x-axis) against the TIME for one ORBIT (on the y-axis)

EXIT TICKET Write a 5 minute essay to answer the burning question: How do planets move? Take the full 5 minutes to write your answer, and try to include information about as many of Kepler’s Laws as you can!

Video https://www.youtube.com/watc h?v=f6foCDF6zI0

FINISHING UP FROM YESTERDAY Complete solar system drawing