Movements of the Earth: Gravity, Inertia, Rotation, Revolution.
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Transcript of Movements of the Earth: Gravity, Inertia, Rotation, Revolution.
![Page 1: Movements of the Earth: Gravity, Inertia, Rotation, Revolution.](https://reader030.fdocuments.net/reader030/viewer/2022032802/56649e0f5503460f94afa23c/html5/thumbnails/1.jpg)
Movements of the Earth: Gravity, Inertia, Rotation, Revolution
![Page 2: Movements of the Earth: Gravity, Inertia, Rotation, Revolution.](https://reader030.fdocuments.net/reader030/viewer/2022032802/56649e0f5503460f94afa23c/html5/thumbnails/2.jpg)
GravityGravity 1. Pulling force that attracts
objects2. Pulls things down on Earth
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GravityGravity
3. Every object has gravity4. Strength depends on mass & distance between objects
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GravityGravity
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A space station is to be located between the Earth and the Moon at the place where the Earth’s gravitational pull is equal to the Moon’s gravitational pull. Which of these locations would be best? Explain
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GravityWhat does gravity do?
1. Holds planets in paths around sun
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GravityWhat does gravity do?
2. Keeps moon in its orbit around the Earth
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GravityWhat does gravity do?
3. Keeps entire universe moving in an orderly way
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InertiaInertia 1. Every object in universe is
moving
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InertiaInertia 2. A body in motion stays in
motion3. A body at rest stays at rest4. Unless acted on by a force
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InertiaInertia 5. Every object tries to stay
the way it isEither moving or resting
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InertiaWhat does inertia cause in space?
1. Moon to keep moving around Earth2. Planets to keep orbiting the sun
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InertiaWhat does inertia cause in space?
3. Galaxies to keep moving through space
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EARTHParts of the Earth
1. Equator- horizontal line dividing north and south hemispheres
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EARTHParts of the Earth
2. Latitude- horizontal lines3. Longitude- vertical lines
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EARTHParts of the Earth
4. Hemispheres- N & S, E & W
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EARTHParts of the Earth
5. Earth’s axis is tilted 23.5 degrees
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EARTH’S MOVEMENTSEarth’s movements
1. Rotation- spins like a top2. Revolution- moves around sun (30km/sec) in oval path
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EARTH’S MOVEMENTSROTATION 1. Earth spins on its axis
2. 24 hours= one rotation3. Causes night and day4. Side of Earth facing sun has day
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EARTH’S MOVEMENTSREVOLUTION
1. Earth goes around sun (orbits)2. Takes 1 year = 365 1/4 days3. Causes seasons4. Hemisphere tilted toward sun has summer
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EARTH’S REVOLUTIONSEASONS 2. When north hemisphere
is tilted toward sun = summer
More direct, intense light rays, warm Earth more
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EARTH’S REVOLUTIONSEASONS 3. When north hemisphere
is tilted away sun = winterWeaker, spread out light rays, warm Earth less
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EARTH’S REVOLUTIONSEASONS 4. When n. hemi has winter,
s. hemi has summer
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EARTH’S REVOLUTIONSEASONS 5. Spring and Fall occur
when neither hemisphere is tilted toward or away from the sun
Equinoxes
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Diagram of Earth’s Seasons