A more direct approach in determining moment of inertia?

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SUMMARY

The discussion focuses on determining the moment of inertia for various shapes without delving into calculus. It highlights the constant values for a sphere (2/5) and a cylinder (1/2), which are essential for calculating moment of inertia using the formula I = cMR². The conversation emphasizes that the proximity of mass to the axis of rotation inversely affects the moment of inertia. Additionally, the parallel axis theorem is mentioned as a useful tool for translating moment of inertia to a parallel axis.

PREREQUISITES
  • Understanding of moment of inertia (I)
  • Familiarity with the formula I = cMR²
  • Knowledge of the parallel axis theorem
  • Basic concepts of rotational dynamics
NEXT STEPS
  • Research the derivation of the moment of inertia for different shapes
  • Learn about the applications of the parallel axis theorem in physics
  • Explore mnemonic devices for remembering constant values of moment of inertia
  • Study the impact of mass distribution on moment of inertia in various objects
USEFUL FOR

Students of physics, mechanical engineers, and anyone interested in understanding rotational dynamics and the calculation of moment of inertia for different geometrical shapes.

bluejay27
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is there a directly knowing the moment if the moment of inertia would be lower for an object? I am emphasizing on knowing the value of the constant value. For a sphere is 2/5 and for a cylinder 1/2, this constant values will be placed at c of cMR^2 without directly going into calculus. A mnemonic perhaps?
 
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I take it you know the definition of ##I##, the moment of inertia ? The closer the massive stuff is to the axis, the lower ##I##. And that's about it. You can go through the list and conclude for yourself there's no tricks or mnemonics.
The parallel axis theorem can be useful to translate to another (parallel) axis.
 
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