# What is a moment/torque?

1. What is a moment/torque? i know the formulas m = fxd (Nm), I know how it works, what is does etc.

2. But think of it fundamentally, how is it possible, that a force becomes greater when the arm of an object becomes larger?

3. another point is with the seesaw if you make the arm on the other twice as long the for is twice as big, how is this possible?

4. fundamentally what is happening?

5. what is happening in the material?

As for the second part of your question (involving lever arms), I think that what this comes down to is the amount of work done is the force applied times the distance over which it is applied, $W = F\Delta x$. This represents the amount of energy that you can put into a system. For a lever with a particular lever arm, if you apply a force pulling down on the lever over a certain distance, you will do a certain amount of work on the system. If you increase the lever arm to twice the length, you can apply the same force over twice the distance, and do twice the work. Or, to make your life easier, you can apply half of the force over twice the distance to do the same amount of work. This is why using a lever helps you perform work.