If a block and tackle arrangement were...

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Question 1 of 205eccef9dbacbc34ba4d45def

If a block and tackle arrangement were rigged as shown in figure "C" of the illustration and "W" is 250 lbs, the amount of force "P" required to hold the load stationary would be __________. See illustration GS-0110.

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🔍 Key Concepts

• How to determine the mechanical advantage of a block and tackle by counting the number of rope parts supporting the moving block • Remember that in ideal conditions (no friction), Load = Mechanical Advantage × Effort • Which rope segments in figure "C" are actually supporting the movable block and load, versus just changing the direction of pull

💭 Think About

• Look closely at figure "C" and trace the rope from where it is made fast to where the free end "P" is. How many sections of rope are directly holding up the lower block and weight? • Once you know the mechanical advantage from the diagram, divide the 250 lb load by that value to get the required pull "P". • Compare your computed pull with the choices. Does your value match one of the options exactly when rounded to two decimal places?

✅ Before You Answer

• Be sure you only count rope segments that are attached to or pass around the moving (lower) block as supporting the load. • Confirm that you are using the ideal formula P = W / (mechanical advantage) with W = 250 lbs (ignoring friction). • Double‑check you did not count any rope segment that only changes the direction of pull but is not lifting the moving block.

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