JEE Main Physics: L-Shape Rod COM Shortcut 💡
❓ Concept 🎬 Rotational Motion — COM of Bent Rod in 59 Sec Rod seedhi nahi hai… right angle pe bent hai? 👉 Samajh jao — COM ko todna padega! 🧠⚙️ Is type ke questions JEE mein frequently aate hain, aur solution hamesha break–combine method se hota hai 🔥 🖼️ Concept Image ✍️ Short Explanation Centre of mass shape se directly nahi milta — mass distribution se milta hai. Isliye bent rod dekhte hi: 👉 use parts mein tod do. 🔹 Step 1 — Golden Rule of COM (FOUNDATION 💯)** Centre of mass depends on: Mass distribution NOT directly on bending or fancy shape Uniform rod ⇒ Mass ∝ Length \text{Mass} \propto \text{Length} 📌 Density same ⇒ longer part = heavier part. 🔹 Step 2 — Bent Rod ⇒ Break Into Parts Right-angle bent rod ko hamesha: 👉 2 straight rods mein tod do Har part: Uniform Known length Known orientation (x-axis ya y-axis) Yahin se problem simple ho jaati hai 😎 🔹 Step 3 — COM of Each Straight Rod (MOST IMPORTANT 🔥)** Unifo...