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Pulley system, demonstrating how pulleys facilitate the lifting of heavy weights (2004) (upload.wikimedia.org)
submitted 4 months ago by to c/physics@mander.xyz
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A gun tackle has a single pulley in both the fixed and moving blocks with 2 rope parts dividing the load of 100N. The mechanical advantage is 2, requiring a force of only 50N to lift the load.

Author: César Rincón

CC BY-SA 3.0

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[–] 1 point 4 months ago (2 children)

It should be 50 N assuming ideal system (0 pulley traction), right? What about non-ideal systems?

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  • [–] 2 points 4 months ago (1 child)

    Wouldn't it be 100, same as the mass being lifted (well more really, depending on the acceleration of that mass)?

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  • [–] 1 point 4 months ago

    No, the other commenters are right — it's between 100 and 150 depending on the angle. And it's like this because we have 50 N + 50 N on both sides of the top pulley (classic pulley thing) + 50 N more attached to it at the bottom. Kinda confusing at first, not gonna lie :)

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