In physics, the reduced mass is the "effective" inertial mass appearing in the two-body problem of Newtonian mechanics. This is a quantity which allows the two-body problem to be solved as if it were a one-body problem. Note however that the mass determining the gravitational force is not reduced. In the computation one mass can be replaced by the reduced mass, if this is compensated by replacing the other mass by the sum of both masses. The reduced mass is frequently denoted by (Greek lower case mu); note however that the standard gravitational parameter is also denoted by . It has the dimensions of mass, and SI unit kg.
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