Why is inertia important? What does it do? If an object has more inertia is it easier or harder to spin?

Hi pclarke21!,

Moment of Inertia is a lot like mass in linear motion. The more you have of it, the harder it is to change the motion of an object. Also, the more you have, the larger your momentum is.

With some formulas:

  • image <— assuming a constant torque, a larger I will result in a smaller angular acceleration

  • image <— The greater I is, the more angular momentum you will have. OR (assuming L is constant) the larger I gets, the smaller w gets

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