# Lab report - Emily Freiman Mr Ouimet Physics 20 November...

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Emily Freiman Mr. Ouimet Physics 20, November 2017 Coefficient of Friction Purpose: The purpose of this lab is to show that the force of friction between two surfaces is independent of surface area and to calculate the coefficient of friction between sandpaper and a wooden board, and felt on a wooden block on the table. Procedure: We started with the sandpaper on the wooden board. My group used the 100 grit sandpaper and the non painted board. We started with the 10 gram mass on top of the sandpaper and using the blue spring scale, we calculated the force needed to pull it across the wooden board. We then did the same thing with 20 grams, 30 grams, 40 grams, all the way to 80 grams. We calculated the weight by multiplying the mass by 9.81.

Unformatted text preview: Next, we used the wooden block with the felt on the table. We started by putting 100 grams on the block and used the spring scale to calculate the force needed to pull it across the table using the big felt side. Each time, we added 100 grams until we hit 900 grams in total. We then did the same thing for the little felt side. Lastly, we made graphs for all our data and calculated the slope of our 3 lines. Conclusion: The coefficient or force of friction does not depend on the surface area of the two objects in contact. Painting the wooden board increases the amount of friction with the sandpaper. The slope of the line represents the coefficient of friction. The equation of the line is...
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