Transcript Earth`s Rotation and Revolution Gravity

Notes
SPI
0807.12.5
to 12.6
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Gravity
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Newton discovered the law of universal gravitation.

Einstein theorized that mass warps/bends/curves space and this
warping explains the force we call gravity
Gravity is a "pulling" force that causes every particle of matter
to be attracted to every other particle of matter
The force of gravity causes our planet to rotate (spin), and it also
makes the planets revolve (orbit) around the sun
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Notes
Earth’s Rotation and Revolution
SPI 0807.12.5 to 12.6
Gravity
Gravity causes our planet to rotate on its own axis
Gravity keeps our planet (and all the other planets) from
“flying off” into space as it revolves (orbits) around the sun
(Do demonstration of rotation vs. revolution)
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Notes
Gravity and the Motion of the Moon SPI 0807.12.5 to 12.6
Gravity
Gravity keeps the moon from “flying off” as it revolves (orbits) the Earth
(See Holt Online Ch15: Sect 4 Visual Concepts)
VC about gravity and orbits
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Review
SPI 0807.12.5 to 12.6
Gravity
1) What is one way gravity helped form our solar
system and planets?
A) By pulling matter together
B) By pushing matter apart
2) What is another way gravity helped form our solar
system and planets?
A) By making objects revolve and rotate
B) By making objects move in straight lines
3) Contrast revolution and rotation
A) Revolve=moving around another object,
Rotate=spinning on an axis
B) Revolving is faster than rotation and has more gravity
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