In this session we are going to deal on the special type of force called frictional force which is defined as the resistance tat one surface or  object that encounters while moving on the other .there are several types of friction they are 1.dry friction,2.fluid friction 3.lubricated friction.
4.skin friction and 5.internal friction.there are even some other types of frictions such as rolling friction,triboelectric friction, belt friction,there are some more types of frictions which are the sub divisions of the dry friction they are static friction,khinetic friction and all the other imp topics are going to discuss in next blog