Question

difference between pressure and stress?

Answer 1

Pressure is the external force per unit area. Pressure=F/A
Stress is the internal force per unit area. stress=p/a
p - internal force
a - area on which p acts

Assuming hooke's law applies, the molecules in the deformed material will tend to return back to original length. Thus the resulting internal force will act to do this. stress = Es

E - modulus of elasticity of material.
s - strain resulting from deformation.
s = dy/dx, where y is the deformation along axis of internal force

If internal force, and area vary with length x, then
y = integral from 0 to L of p(x)dx/(a(x)E)
L is length of material.


Signed,
Forever Alone:D

Answer 2

Seems like you have a hold of it.

What exactly are you confused about?