Various diagrams of contact are considered between man's feet and support in making steps. It is shown why a man falls backwards or sideways in walking on a slippery support. The requirements are justified to shoe's soles used for walking on the slippery support. Some statistical models of frictional contact.
Contact is discussed of real surfaces with a broad scale range of asperities.
Results of simulation are presented of rough contact with adhesion. Real contact area is shown to be governed by adhesion parameter which is characterized by a relation of surface force and pull-off force of surfaces in contact. N., Fugol V. A. Structural and energy theory of friction of solids. A thermodynamic system is considered comprising two bodies in frictional contact. Once the contact has been formed, system's surface reduces by the doubled actual contact area.