Newton's Law of gravitation - Force between 2 objects is directly proportional to product of masses, inv prop to separation of COM squared, Gravitational Field - A region of space around a body in which a mass will experience an attractive force, Arrows on gravitational field lines - Show direction of force on a mass, Density of gravitational field lines - Represent strength of gravitational field, Rate of change of gravitational potential - Tells you the gravitational field strength, Uniform field - When the gravitational field strength is constant, Radial field - Where the gravitational field strength decreases with distance from the body, Gravitational field strength - Force per unit mass experienced at that point in the field, Gravitational Potential - Work done in moving a unit mass from r=infinity to that point, Gravitational Potential Energy - Work done in moving a body from r=infinity to that point, Escape Velocity - Minimum velocity a body must possess at surface of planet in order to completely escape the gravitational field, Keplers Third Law - Time period of an orbit squared is proportional to radius of orbit cubed, Geosynchronous satellite - Time period 24 hours, same angular velocity as earth, orbits above a fixed point, Low Earth Orbit Satellite - Cheaper to launch than Geostationary satellite, Gradient of the tangent at that point - How do you find the GFS from a graph of V vs R, Orbital Velocity - V=SQRT (GM/R), 24 hours - Time period of a geostationary satellite, The Moon - Example of a natural satellite, The ISS - Example of a man made satellite, Decreases - How does satellite velocity change as orbital radius increases?, Increases - How does satellite time period change as orbital radius increases?, Null Point - Point where gravitational field strength is 0 between 2 planets, Vector - Gravitational field strength is this type of quantity, Scalar - Gravitational Potential is this type of quantity, GPS - Possible use of geostationary satellite, Spying - Possible use of low earth orbit satellite, J/Kg - Units of gravitational potential, J - Units of gravitational potential energy, Attractive - Gravitational force is always this in nature, Mr Bellew - The best at basketball in the school,

Gravitational Fields

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