# Lab Report 5 - Lab 106(2).docx - Lab 106(2 Static and...

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Lab 106(2): Static and Kinetic FrictionsClass: Phys 111A – 109Name: Brandon WooGroup Members: Jocelyn Davis, Roy Samuel, Stefan KnapikExperiment day: 10/10/2017Lab Report Due: 10/17/2017Instructor: Wenting ChengIntroductionObjectives1.To measure the static and kinetic frictional forces using a force sensor2.To measure the coefficients of static friction and kinetic friction between surfaces3.To analyze the forces using a Free-Body-Diagram (FBD) and experimentally verify your predictions of static and kinetic forces in the case that a friction cart is pulled up along an inclined plane that involves frictions.BackgroundWhenever the surface of one body slides over that of another, each body exerts a frictional force (f¿on the other, parallel to the surfaces. The direction of friction on each body is opposite to that of its motion relative to the other. Suppose that a block rests on a table with the gravitational force (Fg) of the block balanced by a normal force (FN) of which direction is opposite to that of gravitational force. The normal force is exerted on a body by a surface wherever the body is in contact with the surface of another body. You apply a force (Fapp) on the block attempting to pull it to the right until the block starts sliding. In responding to this force, a frictional force (f) exactly balancing your applied force is directed to the left. The frictional force in this case is called static frictional force (fs). As you increase the applied force further,a limiting point reaches where the block breaks away from the surface and starts to slide, which implies that there is a certain maximum value that the static frictional force can have. When the applied force is larger than the maximum static frictional force (fx,max), the objectstarts to slide and you must continue to exert a force to keep the object sliding. The force acting on the object while it is sliding is called kinetic frictional force (fk). You do not need to apply