Stretch rule

Stretch rule

In physics, the stretch rule states that the moment of inertia of a rigid object is unchanged when the object is stretched parallel to the axis of rotation, (without changing the distribution of mass except in the direction parallel to the axis}. That is, cylinders oriented parallel to the axis must not change in radius.

This rule can be applied with the parallel axes theorem and the perpendicular axes rule to find moments of inertia for a variety of shapes.


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  • stretch — [strech] vt. [ME strecchen < OE streccan, akin to Ger strecken < IE * sterg < base * (s)ter , to be stiff, rigid > STARE] 1. to hold out or reach out; extend [to stretch out a helping hand] 2. to cause (the body or limbs) to reach out …   English World dictionary

  • stretch — stretch1 W3S3 [stretʃ] v ▬▬▬▬▬▬▬ 1¦(make something bigger/looser)¦ 2¦(body)¦ 3¦(reach)¦ 4¦(make something tight)¦ 5¦(time/series)¦ 6¦(in space)¦ 7 stretch your legs 8 stretch (somebody s) patience/credulity 9¦(rule/limit)¦ …   Dictionary of contemporary English

  • stretch — 1 verb 1 MAKE STH BIGGER/LOOSER a) (I, T) to make something bigger or looser by pulling it, or to become bigger or looser as a result of being pulled: My big, blue sweater has stretched completely out of shape. b) (intransitive not in… …   Longman dictionary of contemporary English

  • rule — I n. regulation principle 1) to establish, lay down, make (the) rules 2) to formulate a rule 3) to adopt a rule 4) to apply, enforce a rule 5) to obey, observe a rule 6) to break, violate a rule 7) to bend, stretch a rule 8) to rescind, revoke a… …   Combinatory dictionary

  • rule — ▪ I. rule rule 1 [ruːl] noun 1. [countable] an official instruction that says how things should be done or what is allowed: • The phone companies are working under new rules now. • The company broke government rules to undercu …   Financial and business terms

  • rule */*/*/ — I UK [ruːl] / US [rul] noun Word forms rule : singular rule plural rules 1) [countable] a statement explaining what someone can or cannot do in a particular system, game, or situation We need new club rules before we start looking for more… …   English dictionary

  • rule*/*/*/ — [ruːl] noun I 1) [C] a statement that explains what you can or cannot do in a particular situation grammatical rules[/ex] Players who break the rules are sent off the field.[/ex] You should always follow these simple rules when using electrical… …   Dictionary for writing and speaking English

  • rule — rule1 W2S2 [ru:l] n ▬▬▬▬▬▬▬ 1¦(instruction)¦ 2¦(advice)¦ 3¦(normal/usual)¦ 4¦(government)¦ 5¦(grammar/science etc)¦ 6 the rule of law 7 the rules of natural justice 8 rule of thumb 9 make it a rule (to do something) …   Dictionary of contemporary English

  • rule — 1 /ru:l/ noun 1 INSTRUCTION (C) an official instruction that says how things must be done or what is allowed, especially in a game, organization, or job: the school rules | against the rules: You can t come in if you re not a member it s against… …   Longman dictionary of contemporary English

  • rule — rule1 [ rul ] noun *** 1. ) count a statement explaining what someone can or cannot do in a particular system, game, or situation: We need to change the club rules before we start looking for new members. rule of: the basic rules of the game… …   Usage of the words and phrases in modern English

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