Gravitational fields
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9 Terms
What is Keplers first law?
The orbit of a planet is an ellipse with the sun at one of the foci
What is Keplers second law?
A line segment joining the sun and a planet sweeps out equal areas in equal times
What is Keplers third law?
The square of the orbital period of a planet is proportional to the cube of its orbital distance
What are gravitational fields due to?
Objects having mass
What is the mass of a spherical object modelled as?
A point mass in its centre
What represents gravitational field strength?
The density of the field lines
What is the definition of gravitational potential?
The gravitational potential is the work done to bring a unit mass from infinity to a point
What is the area beneath a force against distance graph?
Work done
What are three characteristics of geostationary orbits?
They have an orbital period of 24 hours in the same direction as the rotation of the earth. They are an equatorial orbit. The remain fixed in the sky to an observer on Earth
