gravitational field strength - gravitational force per unit mass, gravitational potential (at a point) - work done in moving unit mass from infinity to that point, moment of intertia - a measure of an objects resistance to angular acceleration about a given axis, escape velocity - the minimum velocity required to allow a mass to escape a gravitational field to infinity, where the mass achieves zero kinetic energy and maximum (zero) potential energy, centripetal force - force required to maintain circular motion, conservative field (electric / gravitational) - energy required to move a (charge / mass) between two points in a (electric / gravitational) field is independent of the path taken, equivalence principle - it is not possible to distinguish between the effects on an observer of a uniform gravitational field and of constant acceleration), geodesic - path with shortest distance between two points, Schwarzschild radius - distance from the centre of a black hole (singularity) to the event horizon,

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