A rigid body generally means a hard solid object having a definite shape and size. That is, the constituent particles do not change the relative position when deforming force is applied on a rigid body.
Define interatomic forces and give an example?
The force between atoms of the molecule is called interatomic force.
E.g.The nucleus and electron cloud of a molecule is binded by electrostatic force.
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.