How much weight can you lift by applying 100...

Question 1 of 2707066636ee728f7522a1c518342

How much weight can you lift by applying 100 lbs. of force to a twofold purchase rigged to disadvantage (do not consider friction)?

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Question 1 of 27070

Q

How much weight can you lift by applying 100 lbs. of force to a twofold purchase rigged to disadvantage (do not consider friction)?

🔍 Key Concepts

• Mechanical advantage of a twofold purchase (block and tackle) • Difference between rigged to advantage and rigged to disadvantage • Relationship between number of parts of line supporting the moving block and the load you can lift

💭 Think About

• First, sketch or imagine the twofold purchase. How many sheaves (pulleys) are there in each block, and which block is moving? • Count how many parts of line are actually supporting the moving block in this rigged-to-disadvantage arrangement. • Once you know the mechanical advantage, multiply it by the 100 lbs of effort. Which answer choice matches that product?

✅ Before You Answer

• Be sure you are using the correct mechanical advantage for rigged to disadvantage, not advantage. • Confirm you are counting only those line segments that actually support the moving load, not the dead end at the becket if it doesn’t move with the load. • After you find the theoretical load, verify it matches one of the answer choices exactly, since friction is ignored.