Brad Tensen Physics lab 211L sec 54 Coefficients of Friction Introduction: When an object rests on an inclined plane, the force of gravity that is perpendicular to the surface is balanced by the normal force. The force of gravity that is parallel to the surface is balanced by the force of static friction. The static friction equals all other forces that are parallel to the surface. The static friction force has a limit that is proportional to the normal force. The constant for this is called the coefficient of static friction. If the object is sliding, the friction force is directed opposite to the object’s velocity and is still proportional to the normal force. Procedure: 1. Mass the objects that will be used. 2. Mark down on the data sheet whether the broad or narrow side of the object is being used. Also whether it is wood or felt. 3. Then, slowly begin to raise the track with the object on it 4. Find what angle the object starts moving. Write the angle down on the chart. 5.
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