projectiles, satellites and gravity satellite and circular motion
TRANSCRIPT
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PROJECTILES, SATELLITES AND GRAVITY
Satellite and Circular Motion
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Free Fall Motion
http://www.youtube.com/watch?v=nnwmK2Xa5FI 2.5 min on moonhttp://www.youtube.com/watch?v=efzYblYVUFk
http://www.youtube.com/watch?v=7ciStUEZK-Y falling on the moon
http://www.youtube.com/watch?v=8V9quPcNWZESinging on the moon
http://www.youtube.com/watch?v=VIBgVnlXE5UDriving on the moon
http://www.youtube.com/watch?v=f-FxhCZold0Golf ball on moon
http://www.youtube.com/watch?v=2V9h42yspboVomit comet
http://www.youtube.com/watch?v=gTqLQO3L4KoWater balloon in vomit comet
http://www.youtube.com/watch?v=KFPvdNbftOYWashrag in space
http://www.youtube.com/watch?v=o6nhTeLO5yYFive senses: smell in space
http://www.youtube.com/watch?v=qHrBhgwq__QKnitting needle electric force field
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GRAVITY The force of attraction between any two
objects with mass. A field force (a non-contact force) A universal force (Gravity is
everywhere) The weakest of the 4 fundamental
forces
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In orbit around the Earth, Astronauts experience 90% of the gravitational force you experience at the Earth’s Surface
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Gravitational Force Field
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Einstein’s View of Gravitymass deforms the space-time fabric, Earth follows the contour (even light follows the contours of space-time)
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Gravity Fg is the force of gravity and your
weight All objects with mass are
surrounded by a gravitational force field
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Gravity
Gravity depends upon the mass of the objects and the distance between them
M1
M2
d
More mass, more gravity
M1
M2
d
Increase distance, decrease gravity
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Inverse-Square Law Changes in the intensity of gravity are
caused by changes in the mass or in the distance between masses, and follow the inverse-square law.
Electrical and magnetic fields, light, radiation, sound, gravity, and even spray paint.
Systematic decrease in concentration or intensity due to spreading out.
Intensity = 1
d2
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Law of Universal Gravitation Newton’s law of gravity Fg = m1 x m2 x G
d2
G is the gravitational constant 6.673 x 10-11 N x m2/kg2
Can be used to calculate the gravitational force between any two objects
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Universal Law of Gravitation Gravity depends upon --Mass --Distance between masses Differences in the intensity of gravity
can be calculated using Newton’s Universal Law of Gravitation
G is the gravitational constant G = 6.672 × 10-11 m3 /(kg sec2). Measure distance from center of object.
F = G m1m2
d2