Physics II workshop_Part_27

Physics II workshop_Part_27 - Measure the force as you pull...

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56 Week #5
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57 Measuring Friction This is a brief experiment that will let you see the properties of frictional force. Set up the lab-pro and copy the file friction (located in the Labpro folder within the Team Physics 311 folder) to MyDocuments , then open it . Connect a force sensor to Channel 1. Be sure it is on the 10 N setting. Calibrate the force sensor. Obtain a track, a sheet of sand paper, a friction block, and two black bars. Measure the masses of the bars and of the block. Note: The friction blocks have wood and felt sides Only use the wood side! Connect the block and the force sensor with a string. Place one bar on top of the block.
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Unformatted text preview: Measure the force as you pull the block at constant speed (do your best!) both on sandpaper and on metal. Find the average force in each case and then find the coefficient of friction for the case of wood-on-sandpaper and wood-on-metal. Record the average force, the standard deviation, and the number of points included in the average. Turn the block on its edge and repeat the measurements, still with one bar on top. Does the coefficient of friction depend on the surface area? Now return to the large area and place two bars on top. Repeat the measurements. Does the coefficient of friction depend on the normal force?...
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Physics II workshop_Part_27 - Measure the force as you pull...

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