l4 - Today Announcements: HW#2 is due Wednesday 8:00 am....

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ISP209s8 Lecture 4 -1- Today • Announcements: – HW#2 is due Wednesday 8:00 am. HW#3 will be due Wednesday Jan 30 at 8:00am – Extra Credit project #1 in on the LONCAPA website; due Jan 23. •R e v i e w • Gravity, Planetary Orbits - Important lesson in how science works and how ultimately there are simple explanations for complex observations. All observations are unified under Newton’s Universal Law of Gravity.
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ISP209s8 Lecture 4 -2- Review • Motion (position, velocity, acceleration) – what causes acceleration? Force • Force is a vector, it has a magnitude and a direction. • A definition is given by Newton’s Three Laws of Force – If the net force on an object is zero the object will not accelerate. – The amount of acceleration depends on the mass of the object and the amount of the applied force: F = ma . – For every force, there is an equal and opposite force.
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ISP209s8 Lecture 4 -3- Motions of the Stars and Planets • Motions of the heavens • See the example in class from the program CyberSky (can be downloaded from the web).
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ISP209s8 Lecture 4 -4- The Celestial Sphere To us on Earth, it appears that all of the stars, Sun, Moon, and planets move on the underside of a large sphere. This sphere is called the Celestial Sphere .
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-5- Landmarks on the Celestial Sphere Celestial equator projection of the Earth’s equator on the celestial sphere Ecliptic - apparent
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This note was uploaded on 07/25/2008 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.

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l4 - Today Announcements: HW#2 is due Wednesday 8:00 am....

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