Rotational inertia, or moment of inertia, is the rotational equivalent of mass this is the quantity that we want to measure to see how much energy it takes to accelerate a wheel. In the case of a wheel, it is probably obvious that it will take more work to accelerate it if the mass is concentrated out at its edge than at its center. This is not true if you drive the object by rotating it then, how the mass is distributed plays an important role in how much energy it takes to move it. If you move a rigid object in a straight line, it does not matter how its mass is distributed the amount of work to move it will be the same. You’ll need them both as Lennard busts out the physics.
Grab a cup of coffee and your thinking cap. 18, 2008 issue of VeloNews (and later in the September 2010 issue). Editor’s note: The following is an explanation of the inertia test used in the Aug.
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