Gravitation (C18) Flashcards
unit for gravitational acceleration
N/kg or m/s^2
What is a field
A region in which a force acts
What does a gravitational field look like close to the earths surface
parallel lines
what is newtons law of graviation
the gravitational force of attraction between to bodies is equal to the product of their masses and inversely proportional to the square of the distance between them
what is keplers first law
planets move in an ellipse with the sun as one of the foci
why can planets be modelled as circular
usually have low eccentricity
what is the aphelion
furthest point from the sun
what is the perihelion
closest point to the sun
what is kepler’s second law
a line segment joining the sun and planet sweeps out equal area during equal time intervals
what can be said about distance (d) and velocity (v) from the sun
dv is constant
what is kepler’s 3rd law
the square of the orbital period is proportional to the cube of the distance from the sun
what does keplers third law assume
one mass is much larger than the other
large mass is stationary
circular orbit
Name common uses for satellites
communications, gps, weather
what is a geostationary orbit
has constant position relative to earth’s surface
what is LEO
low earth orbit
