Consider some very ground pieces of a non sticky solid material and put it on a piece of paper but be careful that these pieces must be very finely ground (somewhat powdery material but should not be exact powder).
Now stuck your used pen or pencil very hard on that material. I observed that some pieces stick around the nib of pen. Now gently push your pen on that material again I found that some material again sticked around the previously stuck material on the nip of pen.
I don't know which force is responsible for sticking of material around the nib of pen someone said that it is adhesion but I don't think adhesion forces play such a strong role here.Am I right or totally wrong?
I think that I myself understood which forces are responsible and what is happening in this situation so I am posting the answer below.