Could someone me with my physics homework? there are a few problems i did not understand. even if you understand only one i would really appreciate it. they are attached as images. you so much.

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other

It is either a  proton or a neutron im almost positive. hope this .

Simple, don't do it. just don't go to that dock