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lab report 3

# lab report 3 - Devin Seese 3409531 Joe Kinney Problem 1 How...

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Devin Seese 3409531 Joe Kinney Problem 1: How Surfaces Affect the Kinetic Frictional Force Problem Description: In this problem, a wooden block with felt on one side was placed on a track. A string was attached to the block which then was hung over a pulley and attached to a free hanging weight. The free hanging weight pulled the block along the track. Two trials were conducted; once with the wood side of the block facing down, and once with the felt side facing down. This problem investigates the different kinetic frictions that coincide with the different materials. First, predictions were made and an expression was created for the frictional force. Second, the apparatus was assembled. Third, the two trial runs were conducted (wood side and felt side). Times were recorded with a stop watch. Human error could occur at this step (stopwatch operation). Finally, the motion of both trials was recorded by video equipment and was analyzed using a computer program. The results were recorded and compared. The lab required a wood block, string, a track, one pulley, weights, video equipment, and computer software. Prediction: In this problem we are examining the different kinetic forces associated with different materials. Below is the predicted equation in order to find these values. Fk = a ∙ m1/m1+m2 = uk ∙ n Procedure: The procedure included three standard steps: assembly, drop trials, and computer analysis. During the set up, a track was placed on the table, a string was attached to the wooden block 104.5g (+-.01), the string was stretched out and placed over the pulley and attached to a free falling weight 50g (+-.01) and 100g (+-.01). The wooden side of the block was face down on the track and was attached to the 50g (+-.1) weight. The block was released and the time it took to progress down the track was recorded. The time was 2.3s (+-.1). The felt side of the block was face down on the track and was attached to the

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lab report 3 - Devin Seese 3409531 Joe Kinney Problem 1 How...

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