Lab Course Phys 111A-109Lab #5 Static and Kinetic Frictions Name: Ahmad Rathore Group: Krzysztof Skura, Michael Tshimanga Experiment date: 10/11/2016Instructor name: Biao LengIntroductionThe relationship between the fsmaxand the normal for, FN, is; fsmax=μsFN. At the moment right before the object starts sliding, the maximum fs was reached. Static frictional force (fs), increases,balancing out the applied force until the object starts sliding. An applied force is created. Suppose a system exists where a block is at rest on a table. The frictional force is always parallel to the action of these surfaces, opposite of the motion relative to the other. Whenever the surface of one object slides over another surface, friction results.It requires a greater force to start an object moving than it takes to maintain movement. The coefficient of kinetic friction is always smaller than the coefficient of static friction. If sliding takes place at a constant speed, Newton’s First Law applies to the system. The kinetic, or sliding friction between two surfaces is given by: fk= μkFN. . Once an object begins sliding, kinetic friction takes over static friction.Theory:Part1:0<fs<fsmaxfsmax=μsfN fk=μkfNμs = coefficient of static friction.μk = coefficient of kinetic frictionPart 2: Experimental Procedure:NFkFFgNFFgmgsinθmgcosθθ
Part I:Horizontal Surface1.The mass of the wooden cart was measured to be 97.02 grams or 0.09702kg. 2.The force sensor was zeroed.3.The record button in the program was pressed.4.The motion sensor was slowly pulled until the cart started to move. We then continued to pull the cart at constant velocity. 5.After obtaining data, we pressed the stop button and clicked to the Analysis 1 page.