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can you please help i've been confused on this for quite awhile...

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- Thread starter reyrey389
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can you please help i've been confused on this for quite awhile...

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NascentOxygen

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The fartherfor the seesaw example, on the seesaw the farther the object is from the axis of rotation, the LESS torque you actually need.

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sophiecentaur

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Umm. Isn't that more a matter of Moments rather than Moment of Inertia? You are accelerating the same door in each case, about the same hinge. Pushing further out just produces a given torque with less force. The MI tells you how much

I should say that an example to introduce the idea of MI would be to think of a mass on a light pole. The pole is on a bearing at one end and the position of the mass on the pole is adjustable. If you were to push at a point near the pivot, you would find that the angular acceleration of the mass-on-pole would be much greater when the mass is near the pivot than it would be at the end - for a given force. The angular acceleration for a given force (at a given position) is inversely proportional to the square of the distance of the mass from the pivot. The MI is Mx

For a set of masses (or a large object with distributed mass) you just add up all the masses times their x

The MI formula happens to be just the same as the Standard deviation of a statistical distribution - which used sometimes to be referred to as the second moment of a distribution.

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