If a block and tackle arrangement were...

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Question 1 of 205eccef9dbacbc34ba4d45df7

If a block and tackle arrangement were rigged as shown in figure "F" in the illustration, the amount of force "P" required to hold the 324 pound load stationary would be __________. See illustration GS-0110.

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🔍 Key Concepts

• Count how many parts of line actually support the moving block in figure F • Use the mechanical advantage = load ÷ effort idea (ignoring friction) • Remember that the free end of the line where force P is applied may or may not be a supporting part, depending on how it is reeved

💭 Think About

• How many rope segments are directly sharing the 324 lb load in this exact rigging? • Once you know the mechanical advantage, what is ( P = \frac{W}{ ext{MA}} ) with W = 324 lb? • Do any segments of the line just change direction without carrying part of the lifted weight?

✅ Before You Answer

• Carefully trace the rope path in figure F from the fixed point to the free end • Be sure you only count the rope segments that are attached to the moving block or weight, not those attached to the overhead support • After computing ( P ), compare it to the choices and double-check that your mechanical advantage is an integer matching the rig shown

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