Lever balance formula.

The lever is in equilibrium when the product of the force F1 acting on the shoulder l1 on one side is equal to the product of the force F2 acting on the shoulder on the other side l2.
Leverage equilibrium condition: F1 * l1 = F2 * l2.
I write the equilibrium condition in this form: F1 / F2 = l2 / l1.



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