🔍 Key Concepts

• Mechanical advantage in a multi‑sheave purchase (tackle) • How friction in sheaves affects tension in different parts of the fall (line) • Difference between standing part, hauling part, and the parts that pass through the movable block

💭 Think About

• If there were no friction in any sheaves, how would the load be shared by each part of the line? Now, what changes when you add friction to each sheave? • As the line passes through more and more sheaves from the standing part toward the hauling part, what happens to the tension in the line segments? • Which part of the line must supply not only its share of lifting the load, but also overcome all the accumulated friction in every sheave?

✅ Before You Answer

• Be clear on the definitions: standing part (fixed end), hauling part (where you pull), and parts in the movable block (those directly supporting the hook/load). • Consider that friction increases the tension required in the line: which part of the line has experienced the most sheave passes before it reaches that point? • Verify whether the strain is truly equal in all parts once friction is included, or whether one section must carry more to overcome losses.