Physics Ch. 5.5 Pulley's and Mechanical Advantage (4 of 10) Example 4

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We will find F=? of a 5-pulley system attached to the ceiling with a mass W=100N. Ex. 4

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Hiya sir,

In terms of the force acting on the wall, I'm sure the left string would be 40N, but for the right one connected to the wall, I'm not sure, but my understanding would be that it is 80N? So the total force on the wall is 120N. Would that be correct?

omar_kristi
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When I was a little kid my dad told me that two pulleys could save one-half force. Now I see five pulleys make you only use one fifth of force. Is it true that F=(1/#of pulleys)*weight (when the mass of the pulleys is negligible)?

JH-uxre
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Could you please explain how you know to include the bottom two pulleys in the FBD? It's not clear to me how you know that it needs to include both pulleys instead of just the bottom one. Thank you for your help.

gamingguyable