sentences: want conserves are moving on the bottom of the sb of the want desk & a want desk is a mean of preposition & a want point is a mean of preposition & slip occurs when one preposition 's west stay against each other ->  friction will occur between the pool ball and the felt of the pool table  friction will occur between the pool ball and the felt of the pool table & slip companies the sail of an preposition to increase & a want point is a mean of preposition -> friction will cause the speed of the pool balls to decrease