Lab105 - LAB 105 COEFFICIENT OF STATIC FRICTION Mariam...

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LAB 105: COEFFICIENT OF STATIC FRICTION Mariam Selevany, Mohammed Ahmed, Abdul Wali, Andre Amparo, Alfred Continanza Chiranjivi Lamsal Physics 111A 10-15-10 Objective Our objective is to measure the coefficient of static friction between surfaces ms, and to verify that this value is independent of normal force N. And the other objective is to measure the force parallel to an inclined plane that will just cause a block to be on the verge of sliding A) up; and B) down the plane, and to compare these measured values with values calculated from Newton’s first Law. And the theory is that the static friction force Fs between 2 surfaces can assume any value between zero and a maximum value FsMax. The friction force Fs will equal the maximum value FsMax when a body is on the verge of slipping. The relationship between FsMax and the normal force N is FsMax=MuSN. MuS is the coefficient of static friction and it is constant depending on the nature of the two surfaces in contact with each other, while it is independent of the normal force exerted between the 2 surfaces. Experimental Procedure (Block on an flat surface) -Set up the device so that the angle is at 180 degrees. Put Wa on the table of the device and pull the string over the pulley and add mass Wb on the end of the string -Measure the mass of Wa when it is empty. -Now choose a value for Wa and measure the value of Wb that will cause Wa to be on the verge of slipping (max value that doesn’t move the Wa). -Redo the experiment for 6 different values of Wa.
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