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# Aim: To prove the parallelogram law of vector addition

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Introduction

Physics Lab Report (2) -Sagar Batchu (11A) Data collection and Processing: Aim: To prove the parallelogram law of vector addition Apparatus: A wooden board,2 pulleys, thumbtacks, meter rule, long piece of string, meter rule, white A4 size paper, fourteen 0.1 N weights, and three hooks each with a weight of 0.1 Newton. Method: * We first take the wooden board and place it vertically on a flat surface. * We fix two pulleys at the top of the board and then hang the thread around the pulleys. * We make two loops on either side of the string to hang the hooks. * We make a list of the possible combinations of weights we can add on either side of the string. ...read more.

Middle

All these lengths are recorded. Scale: 0.1 N � 1 cm Raw data collected : Sl.no Length of side 1(cm) � 0.1 Weight 1 (N)�0.01 Length of side 2(cm) �0.1 Weight 2 (N) �0.01 Length of diagonal(cm) �0.1 Resultant force (N) �0.01 1. 5.00 0.50 5.00 0.50 7.20 0.72 2. 5.00 0.50 4.00 0.40 7.00 0.70 3. 5.00 0.50 3.00 0.30 6.90 0.69 4. 4.00 0.40 4.00 0.40 6.90 0.69 5. 6.00 0.60 4.00 0.40 7.20 0.72 Diagram : Calculation of average of resultant forces: Favg = (F1 + F2 + F3 + F4 + F5)/5 = (0.69 + 0.69 + 0.70 + 0.72 + 0.72)/5 = 0.70 N * From the above calculation we can see that the average comes exactly to 0.70 N the weight of the center block. ...read more.

Conclusion

Random Errors: In this experiment a major source of random error could be error due to parallax as the lines of the parallelogram are drawn based on the shadow of the string formed. Errors could also be caused when placing the weights on the string. We might have pulled the string disturbing the equilibrium. Improvements and Precautions: * The experiment could have been repeated more number of times for the same set of weights and then an average could have been taken. * It should be ensured that weights are not shaking when the lines are drawn. * Error due to parallax should be avoided by looking at the set up from directly in front of it. * A more accurate instrument such as a vernier calipers should be used to measure the lengths. * The surface on which the board is kept should be perfectly flat. ?? ?? ?? ?? 1 | Page ...read more.

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