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25 Cards in this Set
 Front
 Back
Shape of planetary orbits

ELLIPSES


widest length of an ellipse

MAJOR AXIS


half of the major axis

SEMIMAJOR AXIS


one of the foci of orbits within the Solar System

SUN


the points about which an ellipse is drawn

FOCI (plural for FOCUS)


the flatness of an ellipse

ECCENTRICITY


the eccentricity of a circle

0


when does an orbiting body move faster?

PERIHELION; point closest to focus


point in orbit closest to Sun

PERIHELION


point in orbit furthest from Sun

APHELION


Kepler's first law of motion

ORBITS = ELLIPSES


Kepler's second law of motion

FASTEST POINT IN ORBIT IS AT PERIHELION


Kepler's third law of motion

PERIOD OF ORBIT INCREASES RAPIDLY WITH RADIUS OF ORBIT


Newton's first law of motion

INERTIA


Newton's second law of motion

F=m x a


Newton's third law of motion

EVERY ACTION HAS AN EQUAL AND OPPOSITE REACTION


resistance to change in motion

INERTIA


a constant acceleration directed toward the center of a body

GRAVITY


Newton's view of gravity

A FORCE OF ATTRACTION BETWEEN TWO BODIES, AFFECTED BY DISTANCE AND MASS


The speed required to leave the gravity of a planet

ESCAPE VELOCITY


If mass increases, the gravity of the mass...

INCREASES


If distance from a mass increases, the effect of gravity from the mass...

DECREASES


planets with the least eccentric orbits

VENUS, NEPTUNE


direction of orbit for most moons and planets

COUNTERCLOCKWISE


planets with most eccentric orbits

MERCURY, PLUTO
