2. A material is said to be in the solid
state if all the atoms of that matter
are densely packed together. A solid
material has a definite shape and
size.
In order change the shape & size
of the solid object, an external
force needs to be applied.
3. Elasticity and plasticity.
Applications of elastic behavior of material.
Stress and strain.
Elastic moduli.
Hooke’s law and stress-strain curve.
4. By now, you probably know about
the concept of elasticity. In layman
terms, it means that some
substances get back to their original
shape after being stretched.
For example :- sling shot.
5. Elasticity is the property of a
body to recover its original
configuration [shape and size] when
you remove the deforming force.
For example:- ball tide to a rubber.
6. Plastic bodies do not show a
tendency to recover to their original
configuration when you remove the
deforming forces.
Plasticity is the property of a
body to lose its property of a
elasticity and acquire permanent
deformation on the removal of
deforming force.
7. A slingshot deforms when you stretch it.
However, it regains its original shape when
you take a thin steel rod and try to bend. You
manage to bend it a little and then stop
applying force.
Does the rod regain its original shape ?
No, it doesn’t. this difference in the
behavior of the material is based on their
elastic and plastic nature.
