1. Different models of the Solar System. 2. Causes of the season. 3. The properties of magnetism. 4. The Earth's magnetic field and how it affects compasses. 5. The shape of a magnetic field. 6. The factors that affect the strength of gravity. 7. Calculate weight 8. How gravity affects objects in space.
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Ptolemy's Geocentric Model -> Earth at the center and accepted for over 1500 years
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Copernicus' Heliocentric Model -> Sun at the center, circular planet orbits
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Galileo's Contributions -> One of the first telescopes (support Copernicus)
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Kepler's Improved Model -> Elliptical orbits and moons orbiting planets
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The Earth rotates on its axis (rotation) and resolves around the Sun (revolution)
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Daylight (the hemisphere experiencing summer (e.g., the Northern Hemisphere) is tilted towards the sun)
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North and South poles attract, similar pole repel
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Discovered by Chinese 200 BCE thousands years ago
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Magnetism (Physical) -> Allows certain materials to attract or repel each other.
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Magnetic Field -> Space around a magnet where its force is felt
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To find magnetic field, use iron fillings or compass.
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Earth’s magnetic field is generated by the movement of molten iron in its outer core.
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Protects the planet from harmful solar radiation by deflecting charged particles from the sun.
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Flow from north to south, closed loops, no crossing.
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Gravity -> Force that pulls object together.
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Earth's Gravity (9.8) pull everything toward center.
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Weight -> Force of gravity on an object
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N = kg x N/kg
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Earth orbits sun at 100,000 km/h.
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Factors -> Mass, Distance, Density, Location, Presence of Nearby Masses
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Keeps planets in orbit around the sun, preventing them from flying off into space.
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Causes moons to orbit planets and governs the motion of satellites
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Pulls matter together, which is how stars and galaxies are formed
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Affects the paths of comets and asteroids as they travel through space.
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Affects microgravity environment like ISS.
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Cheatography n. The art of mapping complex subjects into clear, instantly navigable reference guides.
