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25 Cards in this Set
- Front
- Back
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Shape of planetary orbits
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ELLIPSES
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widest length of an ellipse
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MAJOR AXIS
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half of the major axis
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SEMIMAJOR AXIS
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one of the foci of orbits within the Solar System
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SUN
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the points about which an ellipse is drawn
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FOCI (plural for FOCUS)
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the flatness of an ellipse
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ECCENTRICITY
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the eccentricity of a circle
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0
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when does an orbiting body move faster?
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PERIHELION; point closest to focus
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point in orbit closest to Sun
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PERIHELION
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point in orbit furthest from Sun
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APHELION
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Kepler's first law of motion
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ORBITS = ELLIPSES
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Kepler's second law of motion
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FASTEST POINT IN ORBIT IS AT PERIHELION
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Kepler's third law of motion
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PERIOD OF ORBIT INCREASES RAPIDLY WITH RADIUS OF ORBIT
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Newton's first law of motion
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INERTIA
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Newton's second law of motion
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F=m x a
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Newton's third law of motion
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EVERY ACTION HAS AN EQUAL AND OPPOSITE REACTION
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resistance to change in motion
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INERTIA
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a constant acceleration directed toward the center of a body
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GRAVITY
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Newton's view of gravity
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A FORCE OF ATTRACTION BETWEEN TWO BODIES, AFFECTED BY DISTANCE AND MASS
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The speed required to leave the gravity of a planet
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ESCAPE VELOCITY
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If mass increases, the gravity of the mass...
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INCREASES
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If distance from a mass increases, the effect of gravity from the mass...
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DECREASES
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planets with the least eccentric orbits
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VENUS, NEPTUNE
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direction of orbit for most moons and planets
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COUNTERCLOCKWISE
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planets with most eccentric orbits
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MERCURY, PLUTO
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