Here you can explore the relations among Young´s modulus, stress and strain. Stress-strain curves from usual materials are drawn for orientation. The red line represents the E-Modulus that you type or modify with the slider. You can also operate the stress level and check which strain you would obtain for an E-Modulus-Stress level combination. Try some experiments: what happens if you keep the stress level constant but change the material? And if for one material you change the stress level?