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# Coefficient of friction lab report

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Introduction

﻿Aim: To determine the spring constant(k). Introduction: Force applied on a spring to elongate it. The weights of the masses are the forces on the spring. Applied force=WEIGHT Weight is the gravitational force on the objects. Weight is equal to mass times gravity acceleration. W=m.g Weight(W) has a unit of N Mass(m) has a unit of kg. Gravity acceleration(g) has a unit of kgms-2. The extension of the spring is measured by initial and final length of the spring. Extension=final length ? initial length Extension(e) has a unit of cm. ...read more.

Middle

We did nine trials to get our datas. The dependant variable is extension and the independent variable is mass for this experiment. Significant controlled variable is the spring. Conclusion and evaluation: For the spring constant k, we found k=0.1163±0.0009Ncm-1. The real result is k=11.63±0.09Nm-1 in SI unit. The spring constant k, is a measure of the stiffness of the spring. It has a indirect proportion with extension, so measure in the mass and extension of the spring several times and recording them than dividing the weight by the extension should give us the spring constant. The range of uncertainty is calculated by using the uncertainties of weight and extension. ...read more.

Conclusion

The uncertainty of our masses was very small compared to that of the ruler's. It did not affect our result at all since during the graphing the error bars were to small for the weights. The ruler on the other hand gave us an uncertainty that was enough to draw error bars. The main source of error arising from the experimental method during the measuring by the ruler, our precision was not enough because of the spring's little ossilation. We were not efficient with our time since it took lots of time to measure the lengths of the spring while it was ossilating. We think that if we had not to wait for the end of ossilations so much, we could have easily done more than five trials. ...read more.

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