Question

Why steel is more elastic than rubber explain it is on the basis of 11 class

Answer 1

By this definition, steel is more elastic than rubber because steel comes back to its original shape faster than rubber when the deforming forces are removed. ... For a given stress (stretching force per unit area) strain is much smaller in steel than in rubber and hence the answer.

This is one of the most common question among student. everyone thinks that rubber is more elastic than any thing else, because elastic is a synonym for rubber in day to day life, but in physics it is different. elasticity as a property is measured by young’s modulus(Y) the greater the value of ‘Y’ the material is more elastic.

Y=Stress/strain

here stress is proportional to applied force and strain is proportional to elongation of specimen.

now take two identical rods of steel and rubber and apply equal forces on their ends, now measure the elongation in them, obviously the elongation in rubber rod is much greater than that of steel rod. so the value of Y for Steel gets much larger than that for rubber, and so steel is more elastic than rubber.

the value of Y for steel is in range of 200 GPa

while for rubber it is very 0.01–0.1 GPa