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Concentric Forces, Kinetic Friction

# Concentric Forces, Kinetic Friction - Concentric Forces and...

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Concentric Forces and Kinetic Friction September 23, 2008 Sloane Schneider Lab Partners: Taylor Whipple, Cory Wilkinson, Amy Kalal Purpose:

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The purpose of the first part of this laboratory is to learn how to use the polygon method and the component method to find the net force of concentric forces. The purpose of the second part of this laboratory is to establish how the coefficient of kinetic friction depends on mass, material, speed, and area of contact on an object. List of Sub-Experiments: Experiment 1: Concentric Forces Experiment 2: Kinetic Friction Theory: In the first section of this laboratory dealing with concentric forces a few methods were discussed when dealing with vector addition. The polygon method is a technique in which the vectors are placed tail to tip. The resultant vector is drawn with its tail at the origin and an angle can be measured off of the vector’s positive x -axis. Each vector can then be broken into x and y components. To measure the x component of vector M is Mcos( θ ) and the y component is Msin( θ ). The sum of the x -components of the vectors being added is the x -component of the resultant vector, the same is true for the sum of the y -components. In order to find the resultant vector and angle the following equations are used: = + R Rx2 Ry2 = θ arctanRyRx Sears & Zemansky’s University Physics book defines friction as an interaction between surfaces that acts as a force on an object. If friction was eliminated completely an object such as a puck on smooth ice surface would never slow down and would need no force to keep it moving once it has been started.
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Concentric Forces, Kinetic Friction - Concentric Forces and...

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