Question

A piece o f rubber 10cm long stretches 6mm when a load o f 100N is hung from it.
W hat is the strain?

Answer 1

By definition, the strain is the ratio of total deformation $\Delta L = 6mm = 0.6cm$ to the initial dimension $L = 10cm$ of the material body in which the forces are being applied:

$$\varepsilon = \dfrac{\Delta L}{L} = \dfrac{0.6cm}{10cm} = 0.06$$

Answer. 0.06.