Transcript (24APR15) TCAP Review Notes-Gravity and Celestial Motion

Notes
SPI 0807.12.6
Gravity and Celestial Motion
Science
Formation of Our Solar System
Gravity is a "pulling" force that causes every particle of matter to
be attracted to every other particle of matter
Gravity formed our solar system from a nebula
Gravity formed our solar system from a nebula
 Nebulas are huge clouds of cosmic dust consisting of small
particles of matter left over from exploded stars.
 Nebulas rotate due to the force of gravity.
Gravity formed our solar system from a nebula
A) Over time gravity pulled the particles together into
clumps.
Gravity formed our solar system from a nebula
B) Each time another particle was added to a clump by
gravity, the mass and gravity of the clump increased.
 This enabled each clump to attract even more matter.
Mass
More
Increased
Gravity
Mass
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Increased
Gravity
Mass
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Increased
Gravity
More
Mass
Gravity
Increased
Gravity formed our solar system from a nebula
C) Larger clumps had stronger gravity and pulled even
more clumps together.
Gravity formed our solar system from a nebula
D) These large clumps pulled in all directions forming a
roughly spherical shape.
This explains the round shape of stars and planets.
Earth
The Sun
Jupiter
Gravity formed our solar system from a nebula
E) Gravity caused these large clumps to start spinning.
This motion is called rotation.
This is why the sun, planets, and moons rotate.
Gravity formed our solar system from a nebula
F) After a huge mass of clumps were pulled together, the
gravity caused nuclear fusion to occur, and a new star
was “born.”
This is how our sun was formed
Gravity formed our solar system from a nebula
G) Smaller masses of clumps formed into planets and
moons.
This is how planet Earth was formed
Notes
SPI 0807.12.6
Gravity and Celestial Motion
Science
Gravity
causes our sun and planets to rotate (spin)
causes our planets and moons to revolve (orbit)
It keeps Earth, and all the other planets, from “flying off” into
space as they revolve (orbit) around the sun
Question: What keeps our planet from falling into the sun?
The inertia of the lateral (sideways) motion (momentum)
Notes
SPI 0807.12.6
Gravity and Celestial Motion
Science
Gravity keeps the moon from “flying off” as it orbits the Earth
(See Holt Online Ch15: Sect 4 Visual Concepts)
Revolution
Rotation
Question
SPI 0807.12.6
Gravity and Celestial Motion
Science
Question
SPI 0807.12.6
Gravity and Celestial Motion
Science