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Description
Flashcards by Brianna Reilly, updated more than 1 year ago
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Created by Brianna Reilly
about 8 years ago
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| Question | Answer |
| Gravity | A force of attraction between objects that is due to their masses and the distances between them |
| Kepler's 1st Law | Each planet orbits the sun in an ellipse with the sun at one focus |
| Kepler's 2nd Law | As a planet moves around its orbit, it sweeps out equal areas in equal times |
| Kepler's 3rd Law | The square of the orbital period is proportional to the cube of the planet's average distance from the sun. The farther a planet is from the sun, the longer it takes to travel around the sun. |
| What two factors keep a planet in orbit around the sun | The pull of gravity from the sun and the planet's inertia |
| What is the law of universal gravitation? | All objects in the universe attract each other through gravitational force. The strength of the force depends on the mass of the two objects and the distance between them. |
| What is the difference between mass and weight? | Mass is the amount of matter in an object while weight depends on the force of gravity acting upon the mass. |
| Briefly describe the steps in the formation of the solar system | 1. A solar nebula collapsed to form the protostellar disk 2. The sun formed at the center of the protostellar disk 3. Planetesimals formed from dust colliding and combining 4. Planets formed from planetesimals colliding and combining. |
| This image best represents what part of the formation of the solar system? | The collapse of the solar nebula |
| This image best represents what part of the formation of the solar system? | Formation of the sun |
| Solar Nebula | A large cloud of dust and gas from which the solar system forms |
| Planetesimals | Large bodies in space formed from the collision and combing of dust and other particles. These eventually became planets. |
| Why are terrestrial planets located close to the sun? | In the protoplanetary disk, only rocky planetesimals could form close to the sun because it was so hot. This means that only rocky planets can form close to the sun. |
| Why are gas giants located far from the sun? | In the protoplanetary disk, it was cold in the outer regions. This allowed planetismals made of rock and ice to form. Large icy planets formed that had a large force of gravity, which captured large amounts of gas in the atmosphere. |
| What is the order of the planets, moving away from the sun? | Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune |
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