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Hi, I've been learning about moment and there's a lot of things I don't understand

First, in the formula moment = I * alpha, what does I represent and how do we calculate it? All the formulas that I've seen are defined as M = Fr.

Also, I'm wondering, if, say, two people are playing tug of war, they are leaning back. Why must a person lean back to exert force? Also, as they are leaning back, how does couples of moments relate to the fact that they don't start spinning?

I have another problem regarding tension. What is the definition of tension exactly and how do we determine which direction it goes (ex. a rock is hanging on the rope, i know that tension goes up, but why)? Also, when the two people are pulling a rope and both are exerting 100N of force, why is the tension of the rope 100N and not 200n or 0 N

Thanks for any help that you can provide

First, in the formula moment = I * alpha, what does I represent and how do we calculate it? All the formulas that I've seen are defined as M = Fr.

Also, I'm wondering, if, say, two people are playing tug of war, they are leaning back. Why must a person lean back to exert force? Also, as they are leaning back, how does couples of moments relate to the fact that they don't start spinning?

I have another problem regarding tension. What is the definition of tension exactly and how do we determine which direction it goes (ex. a rock is hanging on the rope, i know that tension goes up, but why)? Also, when the two people are pulling a rope and both are exerting 100N of force, why is the tension of the rope 100N and not 200n or 0 N

Thanks for any help that you can provide

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