This lesson is focussed on how we stretch, compress and bend a body.
We have seen that if we stretch a rubber and let it go it deforms but by applying the force, it again regains its original shape.
If we take an aluminium rod and apply very strong external force on it, the shape of the rod might change but it does not regain its original position.
We will take a look why some materials are elastic and why some are plastic.
