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Stretch the Wire

Hang loads on wires and read the tiny stretch. Find Young's modulus and the stretch.

Physics · Class 11 · Stress, strain and Young's modulus · 8 simulations. For JEE, NEET and your boards.

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What you'll learn

  1. Pull per square metre: Stress is the pull on each square metre
  2. Where the pointer stops: Hooke's law: ΔL = FL / AY
  3. Longer and thinner: Same metal, same load: ΔL ∝ L / d²
  4. Heavy cord: A cord's own weight: ΔL = ρgL² / 2Y
  5. Wires end to end: Wires in a line carry the same pull
  6. Two slanted wires: Balance the knot, then stretch each wire
  7. Searle's rig: Searle's rig: Y from the slope
  8. Keep the rod level: Equal stretch, then balance the turning