PHY 101 Study Guide - Comprehensive Final Guide: Inelastic Collision, Elastic Collision, Momentum
29 Nov 2016
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Friction: the force required to overcome the resistance of microscopic hills and valleys and bumping together. Kinetic friction- the friction encountered when surfaces slide against one another with a finite relative speed. Fk acts to oppose the sliding motion at the point of contact between the surfaces. When the normal force (n) is doubled fk is also doubled; fk is proportional to the magnitude of n. Fk= kn k is referred to as the coefficient of kinetic friction, it is the constant of proportionality. N in special cases equals the weight of the object overcoming friction but if someone pushes down on the object n becomes greater than the objects weight which would increase friction. N is less than the weight of the object if it is on an incline. The force of friction opposes motion and is thus not a vector equation b/c n is perpendicular to the direction of motion.
