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Friction Lab Questions (Part 2 Only)

Part 1. The friction force is equal to mg where m is the mass attached to block slides at constant speed. The normal force is equal to Mg where M is block plus added masses. Thus, equation ( 1 ) becomes mg-Afg or m fat . Thus, need to multiply the masses by g to get weight and we can just graph m on the y the x-axis. The slope of the line will be ?. the mass of the -axis and M on Plot graphs of m verses M for the wide side and the narrow side. Draw the best fit line thru the points for each graph and find the slope of these lines. The slope will be the coefficient of friction. Put error bars for m on the graph points. Draw maximum and minimum slopes on the graph and determine the slope of the max and min slopes. The percent error in the slope is given ; this is the predicted % error in /1 for part 1 y oslopc- Find the % difference between the wide side and the narrow side using the data from part 1 . Is the percent difference less than the predicted error? 2(slope) Part 2. From the equation ?.-tane., determine the coefficient of friction for the wide and the narrow sides. Using the equation 4, tan O, and differential error propagation to determine the predicted error in ? for part 2. Find the % difference between the wide side narrow side using the data from part 2. Is the percent difference less than the predicted error? Note: percent difference ang
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