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## Newton's Gravity

by: Alyssa Karounos

157

1

2

# Newton's Gravity Astr 1010-100

Alyssa Karounos
UW
GPA 3.9
Introductory Astronomy 1
Dr. Oliver Fraser

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Discussing Newton's contribution to astronomy with his gravity fromula
COURSE
Introductory Astronomy 1
PROF.
Dr. Oliver Fraser
TYPE
One Day of Notes
PAGES
2
WORDS
CONCEPTS
astronomy, newton, gravity
KARMA
25 ?

## Popular in Astronomy

This 2 page One Day of Notes was uploaded by Alyssa Karounos on Friday January 23, 2015. The One Day of Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 157 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.

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Date Created: 01/23/15
12 1 15 1 Goals A Quantitatively compare the strength of gravitational forces between pairs of different objects 11 Isaac Newton 16421727 A Sent home from London because of the plague I hung out and did physics experiments B Newton s First Law 1 an object at rest tends to stay at rest An object in motion tends to stay in motion 2 C Newton s Second Law 1 Fma 2 a is acceleration a change in speed or direction necessary circular motion III Gravity A what if the same thing that makes things fall on Earth is the same force that makes planets move Newton 1 everyone thought the heavens were different than Earth B 2 lots ofmath l the orbit of each planet around the sun is an ellipse with the sun at one focus 2 as a planet moves around on its orbit it sweeps out equal areas in equal times 3 the more distant planets orbit the sun at slower speeds specifically p2a3 4 He proved Kepler s laws with this formula We still have no idea how gravity works F is the force from gravity G is which we have to measure by doing experiments is a constant M big M traditionally the bigger mass m is little m the smaller mass FQWWUO r is the radius the distance between the two masses IV VI VII VIII IX What if the Earth suddenly doubles in diameter A You would weigh one quarter as much What if the Earth were twice as massive but you only have half your original mass A You would weigh the same What if the Earth balloons to twice its diameter and also gains twice its mass A you weigh half as much What if the Earth moves two times farther away and also doubles its mass A the force is half as much Newton s Third Law A for every force there is an equal and opposite reaction Mechanics of orbit A acceleration is always inward creating circular motion leaving Earth you are accelerating downward yes there is gravity in space you39re always falling going sideways very quickly it doesn t matter what your mass is when you re falling everything falls at the same rate Pioneers 10 11 and 12 we can build rockets and go places 909 7391

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