What is the mechanical advantage, neglecting...

Question 1 of 3104866636ee728f7522a1c51813d

What is the mechanical advantage, neglecting friction, of tackle number 5 as shown in the illustration? Illustration D029DG

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Question 1 of 31048

What is the mechanical advantage, neglecting friction, of tackle number 5 as shown in the illustration? Illustration D029DG

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🔍 Key Concepts

• Mechanical advantage of a block and tackle when friction is neglected • How to count the number of parts of line supporting the moving block • Effect (or non‑effect) of the hauling part on mechanical advantage in this rig

💭 Think About

• First, identify which block is the moving block and trace the rope from the standing end to the hauling part in figure 5. How many rope segments are actually holding up the moving block and weight? • Ask yourself: in this particular reeving, does the hauling part itself support the moving block, or does it only come off the fixed block? How does that change your count? • Consider whether an ideal mechanical advantage, neglecting friction, can be a non‑integer for this simple tackle arrangement.

✅ Before You Answer

• Carefully count each distinct segment of rope that is attached to or passes directly through the moving (lower) block and helps support the weight W. • Verify where the standing part of the line is made fast (upper or lower block) in figure 5, and include that segment in your count if it supports the moving block. • Before choosing, rule out any answer that would require non‑integer supporting parts of line in an ideal, frictionless tackle.