What effect do the forces exert on the lever?

Having studied this material, you need to take out the main thing for yourself:

Lever balance rule.
The less force we apply, the more we have to do the shoulder. Knowing this point, you can always complete the formula yourself.
Monitoring the process.
Analysis.
Output.

Answering directly to the question itself, we can safely say that the force applied to the lever is called a counterweight.



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