Higher Physics Lab Mechanics



Exp-1 To investigate the elastic and plastic extension of metal wires.

  • Easy setup.
  • Modular approach.
  • Young's modulus.
  • Strain.
  • Stress.
  • Elastic Limit.
  • Hooke's law.

Principle and Working:
The ratio of the normal stress to the longitudinal strain is called Young's modulus of elasticity. If a wire of length 's' and area of cross section 'a' be stretched by a force F and if a change (Increase) of length Δs is produced, then
Normal stress =F/a, Longitudinal strain, ε= Δs /s
Modulus of elasticity, E= Normal stress/ longitudinal strain.
In the present setup the extension produced is magnified by 40 times for easy observation on a pointer scale.


Cat. No. Item Name Qty.
C9807 Rod 1m 1
C9812 Rod, 50cm 3
C9808 Rod, 25 cm 2
C2942 A’ shaped base, small 2
SW092 Bosshead 5
C9809 Clamp block 3
SP640 Cu wire, 34 SWG 1
SG436 Constantan wire, 34 SWG 1
C9810 Pulley with 4mm plug 1
C9816 Pointer 1
C8228 Scale 1
C0510 Support clip 1
SW088 Double hooked mass 50g 24

Mechanics Experiments