Physics Lab 106 - Physics 111A-011 Physics Laboratory...

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Physics 111A-011 Physics Laboratory Report Lab number and Title: Lab 106: Static and Kinetic Frictions Name: Elijah Mathew Group members: Abrar Rouf, Dave Dichiara, Dhruv Mehta, John Taglang, Noah Hubert Experiment Date : October 14, 2016 Instructor’s name: Yunpeng Gao 1. OBJECTIVES 1. To measure the static and kinetic frictional forces using a force sensor 2. To measure the coefficients of static friction and kinetic friction between surfaces 3. 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. 2. BACKGROUND AND INTRODUCTION 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 ( F g ) of the block balanced by a normal force ( F N ) 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 ( F app ) 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 ( f s ). 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 ( f s, max ), the object starts 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 ( f k ). You do not need to

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