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The gravitational field strength at a point is the force per unit mass exerted on a mass placed at that point.

You may recall that the gravitational field strength of the Earth near its surface is . This means an object that is near the surface of the earth will accelerate towards it at . We could then define the gravitational field strength as the acceleration an object will experience within that gravitational field.A better definition, however, can be derived from the equation, . Making the subject of this gives us , or .