lab 106 - Physics 111 A Lab 106(2 Static and Kinetic...

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Physics 111 A Lab 106 (2) Static and Kinetic Frictions—Force Table October 19, 2015 Objectives 1. Measure the static and kinetic frictional forces using a force sensor 2. Measure the coefficients of static friction and kinetic friction between surfaces 3. Analyze forces using FBD and experimentally verify predictions of static and kinetic forces Introduction and Background In situations that the surface of one body slides over another, each body exerts a frictional force to the other. The direction of the friction on each body is opposite to that of its motion relative to other. If an object is at rest with a gravitation force which is balanced by a normal force (that is in the opposite direction of the gravitational force). The normal force will be exerted on the body of the object that is in contact with another body of an object. Force is applied (F app ) on the object until it starts sliding, then a frictional force or also known as the static frictional force, balances the applied force on the left. When the applied force is larger than the maximum static frictional force (F s,max ) the object will continue to slide if a force is continuously exerted on it, which is known as kinetic Friction force (F k ). the static frictional force between two surfaces of objects can assume any value between zero and a maximum value (F s,max ). 0 < f s , < f