What is friction? Can you explain it more?

Question

What is friction? Can you explain it more?

Answer 1

Friction is the force resisting the relative motion of two surfaces in contact or a surface in contact with a fluid (e.g. air on an aircraft or water in a pipe). It is not a fundamental force, as it is derived from electromagnetic forces between atoms and electrons, and so cannot be calculated from first principles, but instead must be found empirically.

try this site also for more details.

http://en.wikipedia.org/wiki/Friction

Answer 2

If you examine many surfaces under very high magnification they will look like endless rows of mountain ranges with peaks and valleys.  When two such surfaces are forced together and one must slide past the other the peaks contact each other and must be sheared off to allow motion.  This results in friction that must be overcome by force and it also causes very high temperature at each minute peak being sheared.  If oil or grease is added, the relatively large molecules fill the valleys and cover the peaks which allows layers of lubricant to shear with far less force and heat.  The study of friction (and lubrication) is called tribology (similar to the trials and tribulations when people experience friction in their lives?).

Answer 3

As stated above, it is essentially an electrostatic, non-conservative force. Meaning that it exists due to the electrical interaction between surfaces.

It is non conservative because it dissipates energy.