You are using tackle number 8 in...

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Question 1 of 2066636ee728f7522a1c518e92

You are using tackle number 8 in illustration D029DG below to lift a weight of 100 lbs. If you include 10 percent of the weight for each sheave for friction, what is the pull on the hauling part required to lift the weight?

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🔍 Key Concepts

• Count how many parts of line are supporting the moving (lower) block in tackle number 8 to find the theoretical mechanical advantage. • Determine how many sheaves (pulleys) are in the entire system for tackle number 8 so you can account for friction. • Apply the idea that friction adds 10% of the load per sheave to the weight being lifted before you divide by the mechanical advantage.

💭 Think About

• From the illustration, how many separate sections of rope are actually holding up the weight in tackle 8? That number is your ideal mechanical advantage. • Once you know the number of sheaves, how does adding 10% of the 100‑lb load for each one change the effective weight that must be lifted? • After adjusting the weight for friction, what do you get when you divide this effective weight by the mechanical advantage you counted from the drawing? Compare that result with the answer choices.

✅ Before You Answer

• Be sure you only count parts of line attached to the moving block, not every visible rope segment in the picture. • Confirm you have counted all sheaves in both the upper and lower blocks when adding the 10% friction per sheave. • Before picking an option, check that the required pull you calculate is less than 100 lbs but greater than the ideal frictionless value for that tackle arrangement.

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