If you fix a 3N load at a point 12 cm from the fulcrum, then at what distance should

If you fix a 3N load at a point 12 cm from the fulcrum, then at what distance should you fix a 4N load in order to balance the lever?

According to the balance rule of the lever:
F1 / F2 = l2 / l1, where F1 is the force acting on the shoulder l1 (F1 = 3 N); F2 is the force acting on the shoulder l2 (F2 = 4 N); l1, l2 – lever arms (l1 = 12 cm).
Let us express and calculate the length of the lever arm l2:
l2 = (F1 * l1) / l2 = (3 * 12) / 4 = 36/4 = 9 cm.
Answer: The lever arm with a weight of 4 N is 9 cm.



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