What is the difference between stress and strain?
When a body is subjected to forces such that it is still at rest then some forces develop in the body. These forces are such that they oppose any kind of deformation in the body. These are called stress. Stress is actually not a force but it is developed due to forces which are internal. By hooke’s law Stress = Force applied on object /area of the object on applying side The object usually changes its dimensions by a very small units.But these change in the dimensions are usually not neglected. Let e be the change in the dimensions then e = FL/AY where A is the cross sectional area Y is the young’s Modulus of the material L is the initial length of the object Stress has N/m^2 as its units When stress develops then strain also develops in the object.Strain is defined as “Change in dimension upon original dimension” Thus strain = e/L = F/AY This is a unitless quantity.
