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Experiment Frictional Force (AP)

# Experiment Frictional Force (AP) - AP Physics Experiment...

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AP Physics Experiment – Frictional Forces Purpose To determine the coefficient of rolling friction μ r . Procedures 1. Measure and record the weight (N) of the Hall’s carriage cart using a triple beam balance or electronic scale. (grams x 0.0098 = Newtons) 2. Measure and record the radius (r) of any wheel of the cart (m) using a metric ruler. 3. Attach a string to the cart. Pass the string over the pulley on the opposite end of the incline plane parallel to the surface . Attach a weight hook to the end of the string. 4. Adjust the inclined plane to zero degrees. Check that the surface is level. 5. Add masses to the hanger until the cart begins to roll at a constant speed along the surface. 6. Measure and record the weight (N) of the hanger with the attached masses. 7. Calculate the coefficient of friction for the surface using the equation μk= (wheel radius) multiplied by the absolute value of [(Cart Weight)sinθ - Attached Weight] / [(Cart Weight)cosθ].

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