Purpose:
Students conducted an experiment to determine the kinetic friction coefficient between a block and a table.
Lab:
The lab was accomplished using string, block(s), and a force sensor. It was setup in this way:
The block was connected to the force sensor through the string which would allow the students to record the force necessary to pull the block.
The students first had to zero the block through logger pro to minimize error in data collection. The students then measured the mass of the block and recorded it and then pulled the force sensor at a constant velocity to record the force necessary to move the block.
The force was displayed through a graph:
The slope of the velocity vs time graph was determined to be the average kinetic friction force.
The experiment was repeated five times with a block added each time. The mass of the blocks and the average force from the force sensor was recorded each time into a table:
The students then used the data to plot a graph of Normal force vs Kinetic friction force and as explained in the static friction lab, the slope of this graph would theoretically be the kinetic friction coefficient.
Graph:
Conclusion:
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