You are using tackle number 7 in...

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Question 1 of 2066636ee728f7522a1c518e90

You are using tackle number 7 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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Question 1 of 20

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🔍 Key Concepts

• Identify how many parts of line actually support the moving block in tackle number 7 of illustration D029DG • Use the formula for mechanical advantage of a block and tackle (ignoring friction) before adjusting for losses • Account for 10% of the load per sheave as extra effective weight due to friction

💭 Think About

• How many sheaves (individual pulleys) are being used in tackle 7, and how many parts of line are sharing the 100 lb load? • Once you know the ideal mechanical advantage, what would the hauling part tension be with no friction, and how does adding 10% of the load for each sheave change the effective load? • After adding the friction, which answer choice most closely matches the required pull on the hauling part?

✅ Before You Answer

• Carefully count only the sheaves that actually turn in tackle 7 (not in the other tackles) • Verify the number of supporting parts of line going to the moving hook/weight in tackle 7 • Recalculate the effective weight = real weight + friction allowance before dividing by the mechanical advantage

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