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#5physicslab

# #5physicslab - Tyler Lisowski and John McCauley Lab#5...

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Tyler Lisowski and John McCauley Lab #5: Coefficient of Friction Abstract: The purpose of this lab was to find coefficients of friction both kinetic and static using a wooden ramp, a wooden block, and a pulley. We found both types of coefficients of friction in the experiment. We also discovered through testing that the normal force did not have a significant influence on the coefficients of friction. This idea was proven by varying the mass on the block and the amount of mass it took to make it move down the ramp with a constant velocity.

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I. Purpose: The purpose of this lab was to show the relationship between static and kinetic coefficients of friction. It also was done to prove that static coefficients of friction are always greater than kinetic coefficient of frictions for the same object. Lastly, this lab was performed to show that the normal force of an object has no effect on the coefficients of friction. II. Hypothesis: If the normal force is varied, then there will be no change in the coefficients of Friction. Also, we hypothesized that kinetic coefficients of friction are always smaller than static coefficients of friction III. Materials: Smooth wooden board, smooth wooden block, string, balance and calibrated masses, mass holder and slotted masses, pulley, and protractor IV.Procedure: Part 1: 1. Place the block face down on the wooden board and raise the board until the block just begins to slip. Find the angle-using trigonometry and record it as the angle for static friction in the Data Table. 2. Repeat step 1 for three more times having a total for different angles. Put the block at different spots on the wooden board and use the same side for each trial. 3. Place the block on the wooden board and rise until the block moves with a constant velocity after a slight push to start the block in motion. Record the angle as the kinetic friction in the Data Table.
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#5physicslab - Tyler Lisowski and John McCauley Lab#5...

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