The stress-strain graphs for materials A and B are as shown in figure. Which of the material:
(i) has greater value of Young's modulus,
(ii) is more ductile or more brittle?
(i) For graph A, slope of OE is more than that of graph B. Therefore, Young's modulus of material A is greater than that of B.
(ii) Material A shows wider plastic region than that of B. Thus, A is ductile than B and B is more brittle than A.
Adhesive force is the attractive force between two unlike molecules. They are caused by forces acting between two substances like electrostatic force (attraction due to opposing charges), mechanical force etc.
E.g., Force of attraction between gum and paper.
Inter-atomic or inter-molecular forces are electrostatic in nature.