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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