# Phys 221 Lab 6.docx - Experiment 6 Coefficient of Friction...

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Experiment 6: Coefficient of Friction Jasmine HendersonLab Partner: Hayley HatcherMarch 23, 2016
AbstractThe frictional force between a wooden block and a wooden plane with a horizontal and inclined plane will be measured. These measurements will then be plotted to give the coefficients of kinetic and static friction will be obtained by calculating the slope of the line using graphical analysis. The angle of repose is used to determine the coefficient of static and kinetic friction at aconstant velocity. This method is used by measuring the angle at which the block begins to slide down an inclined plane by using µk=tanθ.
Results PresentationSliding MethodAdded Mass (kg)Kinetic FrictionalForce (N)Static Frictional Force(N)Normal Force (N).5001.543.656.521.003.035.8911.411.5004.448.6216.312.006.4212.4321.222.5007.2714.1826.113.008.0415.3031.01Line of best fit µk=.271 Line of best fit µs=.518Inclined PlaneCalculated:Fk=mgsinθ+ffFk=(.1648kg)(9.8m/s2)sin(30°)+1.541N=5.15 NMeasured:Fk=5.18 NAngle (°)Kinetic FrictionalForce Calculated(N)Kinetic FrictionalForce Measured(N)Percent Error (%)305.155.180.583Force Diagram:
Static Friction- Angle of ReposeAdded Mass(kg)Angle of Repose(°)Static Coefficient of Friction.50026.4871.0036.625Kinetic Friction- Angle of ReposeAdded Mass (kg)Angle of Repose(°)Kinetic Coefficient of
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