Lift Upward Acceleration Trick — NTSE Physics in 59 Sec ⚡
❓ Question A man of mass 75 kg stands in a lift. The lift starts moving upward with an acceleration of 2 m/s² . Find the force exerted on him by the floor . 🖼️ Question Image ✍️ Short Solution This is a Newton’s Laws + apparent weight question. When lift accelerates upward → normal force increases 💯 🔹 Step 1 — Understand Forces on the Man (MOST IMPORTANT 💯) Two forces act: Upward → Normal Reaction (N) Downward → Weight (mg) Since lift is accelerating upward , net force is upward. 🔹 Step 2 — Apply Newton’s Second Law N − m g = m a N - mg = ma N − m g = ma 👉 यही सबसे important equation है 🔹 Step 3 — Substitute Values Mass: m = 75 kg m = 75 \text{ kg} Acceleration: a = 2 m/s 2 a = 2 \text{ m/s}^2 Take: g = 10 m/s 2 g = 10 \text{ m/s}^2 N − ( 75 × 10 ) = 75 × 2 N - (75 \times 10) = 75 \times 2 N − 750 = 150 N - 750 = 150 N = 900 N N = 900 \text{ N} 🔹 Step 4 — Interpret the Result 👉 Normal force = apparent weight ...