Gravitational Fields Flashcards Preview

Newtonian World > Gravitational Fields > Flashcards

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


Geostationary Orbit

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

F= (GMm)/r^2


Equation for gravitational field strength, or to determine the mass of the earth

g= (GM)/r^2


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


How can Kepler's third law be used to solve problems?

T^2 α r^3 which can be used for planets and satellites