What is the mechanical advantage of a...

Question 1 of 3104866636ee728f7522a1c518143

What is the mechanical advantage of a threefold purchase when rove to disadvantage and neglecting friction?

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Question 1 of 31048

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What is the mechanical advantage of a threefold purchase when rove to disadvantage and neglecting friction?

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🔍 Key Concepts

• Mechanical advantage (MA) of tackles and purchases • Difference between rove to advantage and rove to disadvantage • How to count the number of supporting parts of line on the moving block

💭 Think About

• Sketch a threefold purchase (three sheaves in each block) and identify which block is moving and which is fixed. How many parts of the line are actually supporting the moving block? • For a tackle rove to disadvantage, where is the hauling end located, and how does that change the mechanical advantage compared with rove to advantage? • Think about the general rule for ideal tackles: how is theoretical MA related to the number of parts of line at the moving block when friction is neglected?

✅ Before You Answer

• Be sure you are counting only the line segments attached to or passing through the moving block, not every segment you see in the system. • Confirm whether the hauling part is attached to the fixed or moving block, and recall how that affects the MA. • Double‑check that you are using the ideal (no friction) case so you don’t add or subtract from the theoretical MA.