A small body having mass 1kg is rotating in a circle of radius 10cm. It is connected to the centre with the help of a string having young’s modulus = 1011N/m2. Find change in length of wire while the mass is rotating with constant speed of 2m/s. The cross sectional area of string is 1cm2.

Elastic modulus measures the resistance of the material to elastic—or “springy”—deformation.

Low modulus materials are floppy and stretch a lot when they are pulled (squash down a lot when pushed). High modulus materials are opposite—they stretch very little when pulled (squash down very little when pushed).