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physics lab report. Aim To determine the coefficient of static friction (μs) between a wooden block and a granite plane

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To determine the coefficient of static friction (μs) between a wooden block and a granite plane.

Data Collection

Table (1): hanging mass needed to move the (wooden block + masses).


Mass of wooden block + masses (M1) (g)


Mass of hanging masses (M2) (g)














Data Processing and Presentation

  1.        Coefficient of static friction (μs)

...read more.




image09.png                        Weight                                Tension (T)


image11.pngimage12.png                        Hanging masses

                                                Weight (W2)

Figure (1): the setup of the experiment and the free body diagrams of the hanging masses and the (wooden block + masses)


M1: mass of wooden block + masses                                

M2: mass of hanging masses

N: normal force

fr: frictional force

W1: weight of wooden block + masses

W2: weight of hanging masses


g: acceleration due to gravity

μs: coefficient of static friction

At the instant of motion:

                                            Frictional force (fr) = Weight(W2)

                                                                       fr  =  W2(substitute fr = μs* N)

                                                               (μs) (N) = (M2) (g)         (substitute N=W1)

                                                            (μs) (W1)

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  1. Placing a photogate connected to a lamp or bell exactly in front of the (block + masses). When the block moves, however slightly, the lamp would light up or the bell would start ringing to indicate the motion of the (block + masses).
  1. Making sure the scale of the balance is always viewed at a right angle to avoid parallax error.
  1. Conducting more trials and taking the average result in order to minimize the affects of random error.

...read more.

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