Flashcards in Gravitational Fields Deck (11):
Gravitational field strength
force per unit mass
Newton's law of gravitation
the gravitational force between two masses is proportional to the product of the masses and inversely proportional to the distance squared between them
Deriving Kepler's law
Equate the centripetal force to gravitational force.
x by r.
substitute centripetal velocity then rearrange for T^2.
Kepler's third law
the cube of the planets distance from the sun divided by the square of the orbital time period is the same for all planets
an equatorial orbit with a time period equal to the rotation period of the earth and in the same direction as the earth’s rotation
Uses for geostationary satellites
Radio communications, spying
which equation can be used to find the force between two point masses or spherical objects
Equation for gravitational field strength, or to determine the mass of the earth
describe the gravitational field strength of the earth
close to the surface it is uniform and approximately equal to the acceleration of free fall
How/why do you use the inverse square law
to analyse circular orbits by relating the gravitational force to the centripetal acceleration it causes