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10 Cards in this Set
- Front
- Back
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What is gravity? |
The force of attraction between objects that is due to their masses and the distances between them. |
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Describe Newton's law of gravitation. |
The law of gravitation states that all objects in the universe attract each other through gravitation force. When gravitation force increases, the mass increases. As the distances increase, the force decreases. |
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Describe KEPLER's law of planetary motion. |
Each planet or any other body orbits the sun in an elliptical pattern with the sun at one focus. |
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Describe the shape of the orbits of planets in our solar system. |
elliptical |
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From which object did our solar system form? |
solar nebula |
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What is a planetesimal? |
larger bodies that collide with each other, to make kilometer-sized planetesimals. |
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Describe gas giants and terrestrial planets. |
gas giants: planets that have rocky, metallic cores, and deep atmospheres of gas and ice, and were formed in the outer disk. Terrestrial: rocky, metallic planets that formed from the collisions and mergers of rocky planetesimals. |
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Describe the formation of our solar system. |
a cloud called the solar nebula, collapsed, then a protostellar disk formed from the collapsed solar nebula, then all of the heat going to the middle to form our sun, and then planetesimals forming our planets. |
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Describe the role of gravity and centripetal force in the motion of planets around the sun. |
gravity and centripetal force pull the planets in a circular motion, and keep the planets from flying off into space. |
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Describe the geocintric and heliocintric models |
geocintric: everything orbits the EARTH heliocintric: everything orbits the SUN |
