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# physics lab report. Aim To determine the coefficient of static friction (&amp;#956;s) between a wooden block and a granite plane

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Introduction

Aim

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).

 Trial Mass of wooden block + masses (M1) (g)(±0.05g) Mass of hanging masses (M2) (g)(±0.05g) 1 357.60 152.60 2 560.00 202.90 3 761.80 304.40 4 964.20 385.80

Data Processing and Presentation

1.        Coefficient of static friction (μs)

Middle     Weight                                Tension (T)   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)

Variables

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

Constants

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)

Conclusion

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.

This student written piece of work is one of many that can be found in our International Baccalaureate Physics section.

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