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PHYS Lab #6

# PHYS Lab #6 - David Thibodeaux Lab 105 Coefficient of...

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David Thibodeaux Lab 105 – Coefficient of Static Friction PHYS 111A – H03 10/22/2010 Objective: To measure the coefficient of static friction between surfaces ms, and to verify that this value is independent of the normal N. Equipment list: Friction apparatus, Standard set of weights (x2), Wooden cart, string, 50 g weight hanger, level. Procedure: 1. Choose a value for Wa. Measure the value of Wb that will just cause Wa to be on the verge of slipping (maximum value that doesn’t move the Wa). 2. Do the experiment for 6 different values of Wa. 3. Record the values for your measurements of Wbmax. Theory: For the first situation, a weight was dragged across a flat plane with an unknown friction coefficient. In order to solve for friction, the following equations were used: F Wb – F Friction = m Wa g m wb a - μ x n = m Wa g m wb a - μ x mgcos θ = m Wa g After finding a proper equation for friction, five tests were run, and the following results were produced: Trial W a (N) W b (N) μ s 1 3.442 .7167 .2082 2 4.443 .8526 .1919 3 5.403 1.081 .2001 4 5.403 1.568 .2902 5 6.3829 1.751 .2687 μ

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