Physics is Fun and so is Friction

Friction is fun, yes it is.  Friction first of is noted as "f", a little f so as not to be confused with the big "F" of force.  f=(mu)(normal force); mu is pronounced as "mew" as appears as a lower case "u" with a longer first stroke, thus f=un (the u is the mu-best attempt).  Friction as defined as "a force that resists the motion of one object sliding past another."  Friction enables us to walk, run, and sit.  If there was no friction we would slip and slide and not be able to stand up.  Friction can be broken up into static friction, a "force that resists the sliding motion of two objects that are stationary relative to one another" and kinetic friction "when an object slides along another".  Static friction requires more force to overcome it and make the object move.  Kinetic friction requires less because the object is currently in motion and has moving inertia.  This explains why it is harder to get things moving at first then it is to continue to move said object.  In the background, I am moving the block of wood up the wall.  As stated in the definition of friction, in this example, friction would be working against my force in a downwards direction.  Conversely if I were to hold the block in place the block would want to move down and friction would then be upwards.  Not the best example of friction, I'm sure, but this just goes to show that Physics is always all around us and sometimes goes unnoticed.