What is the mechanical advantage of tackle...

Question 1 of 3104866636ee728f7522a1c518241

What is the mechanical advantage of tackle number 7 as shown in the illustration? Illustration D029DG

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Question 1 of 31048

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What is the mechanical advantage of tackle number 7 as shown in the illustration? Illustration D029DG

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🔍 Key Concepts

• Mechanical advantage of tackles is usually equal to the number of parts of line directly supporting the moving block or the load (ignoring friction). • Difference between a fixed pulley (changes direction only) and a movable pulley (actually travels with the load). • In some rigs, the hook and the block are not the same thing – focus on what is really moving with the weight W.

💭 Think About

• In tackle number 7, identify what actually moves when the weight W is lifted: does the upper block move, the lower hook move, or both? • Count how many segments of the rope are directly sharing the load W (touching the moving part attached to W), not just passing over sheaves. • Compare this arrangement to a simple single fixed pulley you may have seen before – does the rope here do anything more than change direction?

✅ Before You Answer

• Be sure you are counting only the line segments that are supporting the moving load W, not the dead end of the line that is fixed to the overhead. • Confirm whether the pulley in number 7 is fixed or movable relative to the overhead support. • Verify that the mechanical advantage cannot be less than 1.0 unless the system is actually making the pull harder instead of easier.