# Lab Report 106(2): Static and Kinetic Frictions - Yasin...

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Yasin Baala, Kadeem Spencer, Kevin Wheat, Adrien Salvador, Julian Lenartowicz PHYS111A-031 Lab 106(2): Static and Kinetic Frictions Introduction This lab has three objectives. First we are to measure the static and kinetic frictional forces using a force sensor. Next, we are to measure the coefficients of static friction and kinetic friction between surfaces. And finally we are to analyze the forces using a Free-Body-Diagram (FBD) and experimentally verify our predictions of static and kinetic forces in the case that a wooden cart is pulled up along an inclined plane that involves frictions. As a bit of background, frictional force creates a force opposite to the direction of an object’s motion. Frictional force is the result of the “roughness” of two surfaces as they rub against each other. The equation for frictional force is μN, where μ is the coefficient of friction (which varies from surface to surface depending on their “roughness”) and N, which is the force a surface exerts on the object it is supporting. There are two different coefficients of friction for