Physics 111A - Lab 106 - Aris Rafael Lab Partners Bao Duong...

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Aris Rafael Lab Partners: Bao Duong, Hiroaki Okazaki, Jayro Saire Physics 111A – 015 Professor Yan Liu Lab 106: Static and Kinetic Frictions Date Due: 10/14/15 Introduction The purpose of this lab was to study the static and kinetic frictional forces. These frictional forces were measured by using a force sensor. Their frictional coefficients were calculated using free body diagrams and the computer to find the maximum static friction force and kinetic friction force. Finding and comparing the theoretical and experimental values of these coefficients were the primary goal of this experiment. The lab was conducted in two parts: wooden cart on horizontal plane (Part I) and wooden part on inclined plane (Part II). The frictional force associated when an applied force is attempting to move an object but not having it move is static friction. f s,max = μ s F N Once the applied force becomes so great that the object is now moving, the frictional force associated with this event is kinetic friction. f k = μ k F N Typically, the coefficient of kinetic friction μ k is smaller than the coefficient of static friction μ s . This results in the common thought that it is easier to keep something in motion across a horizontal surface than to start it in motion from rest.

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