parallel axis theorem

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parallel axis theorem

[′par·ə‚lel ¦ak·səs ‚thir·əm]
(mechanics)
A theorem which states that the moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia that the body would have about the given axis if all the mass of the body were located at the center of mass. Also known as Steiner's theorem.
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References in periodicals archive ?
The Steiner Theorem for Trapezium (Jakob Steiner, 1796-1863)
The students noted that Steiner's proof was comparable to the solution of their problem (the proof of which is given below) and thus were stimulated to continue researching the use of the Steiner theorem for the trapezium, which ultimately led to an interest in general geometric constructions according to the rules of ancient Greek mathematics, and building geometric figures using a straightedge only.
In addition, the solution requires some knowledge of the following special properties of trapeziums (of which the students are usually not aware), such as the Steiner theorem for a trapezium, and which should be introduced to them during presentation of the problem.
Property B: Is a result of the Steiner theorem for the trapezium.
Constructing an application of the Steiner theorem for the trapezium (will be used below)