8 Astrophysics – Part B “Orbits”

Syllabus Aims…

8.2 know that:

• the universe is a large collection of billions of galaxies
• a galaxy is a large collection of billions of stars
• our solar system is in the Milky Way galaxy.

8.3 understand why gravitational field strength, g, and know that it is different on other planets and the Moon from that on the Earth

8.4 explain that gravitational force:

• causes moons to orbit planets
• causes the planets to orbit the Sun
• causes artificial satellites to orbit the Earth
• causes comets to orbit the Sun

8.5 describe the differences in the orbits of comets, moons and planets

8.6  use the relationship between orbital speed, orbital radius and time period:

orbital speed = (2 × π × orbital radius)/time period

v=2rπ/T

Resources…

Use these PowerPoint for a quick review….

• Lesson 1 Days Years and Seasons
• Lesson 2a 2b Phases of the Moon and Eclipse
• Lesson 3a 3b Gravitational Forces and Orbits

Main lesson PPT….

• 8 Astrophysics Part B Orbits

Further Resources….

• Speed of Light Calc
• Graphs for Solar System
• Arrokoth the most distant object ever visited (Wider Reading)
• Voyager 2 Back Online (Wider Reading)
• Investigating circular motion Practical
• Investigating circular motion Practical Results
• Lesson 2 Maths Challenge Worksheet
• Lesson 2 Orbits Exam Questions
• Gravitational Force F=ma extra help video
• Gravitational Fields g =GM/r^2 extra help extension video
• Circular Velocity v= 2πr/T extra help video
• iPad QR Code Reader
• Android QR Code Reader

Useful Videos…

8B Astrophysics Orbits iGCSE Key Physics Section Summary

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8B Astrophysics Orbits iGCSE Key Physics Section Summary

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Kepler’s First Law of Motion - Elliptical Orbits (Astronomy)

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✵✵✵✵✵ Kepler's First Law of Motion
ELLIPTICAL ORBITS (Astronomy)
With his first law of planetary motion, Kepler rejected circular orbits and showed that an ellipse could better explain the observed motions of Mars. Generalized to all planets, it states that the orbit of a planet follows an ellipse with the Sun at one focus.
Do you know how to draw an ellipse? We show you a neat trick in this video using a piece of string, a pencil, and a couple of pushpins.

✵✵✵✵✵ CHAPTERS
You can jump to chapters in the video here:
0:00 Introduction -Tycho Brahe data
0:41 Competing theories
1:33 The ellipse and elliptical orbits
2:15 Eccentricity
3:03 General statement of Kepler's 1st Law

We have videos for all 3 laws!
Kepler's 1st Law: http://bit.ly/1XCVRSQ
Kepler's 2nd Law:http://bit.ly/1lzhLVQ
Kepler's 3rd Law: http://bit.ly/1MZ35bR

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✵✵✵✵✵ CREDITS
Presented by Liliana de Castro
Written by Meg Rosenburg and Kimberly Hatch Harrison
Produced by Kimberly Hatch Harrison & Michael Harrison

#Astronomy #Kepler #KeplersFirstLawShow More

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