# Lab 106 - Lab 106(2 Static and Kinetic Frictions Amr Saleh...

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Chapter 12 / Exercise 5
Physics Laboratory Experiments
Wilson
Expert Verified
Lab 106(2): Static and Kinetic FrictionsAmr SalehLab Partner: Lucas, Zach, John 3/01/16Section: 111A-010Professor Yan LiuIntroductionObjectives:To measure the static and kinetic frictional forces using a force sensor;To measure the coefficients of static friction and kinetic friction between surfaces;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 and incline plane that involves frictions.Background:Whenever 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
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Chapter 12 / Exercise 5
Physics Laboratory Experiments
Wilson
Expert Verified
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 surfaceand 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 object starts to slide and you must continue to exert a force to keep the object sliding. The forceacting on the object while it is sliding is called kinetic frictional force (fk). You do not need to apply quite as much force to keep the object sliding, as you needed to originally break free at static friction. The static frictional force (fs) between two surfaces can assume any value between zero and