LAB 121

# LAB 121 - 6 Afterwards calculate the percent error Data and...

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LAB 121: FORCES ON A STRUT Livia Kuruvila Amy Patel Kunal Rana Vikram Ramkumar Phys 111A-001 December 7, 2010 Chiranjivi Lamsal

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Introduction: In this experiment the objective is to determine the tension on the supporting cord and the strut. In order to assess this, we must find the torques about the pivot point of the strut. Torque is the cross product of distance r , which is the axis of rotation to the point of force attachment, and the force F. The equation used in this lab is known as τ = r x F . The magnitude of torque |τ| = | r | * | F | sin( θ ). When the body is in rotational equilibrium, the sum of all the torques τ net must equal zero. In order to calculate T, we use the equation Tsin θ L3= W1L1 + W2L2 +W rod ( L/2) . In order to find θ we use the equation θ = tan^(-1) y/x . Procedure: 1. Measure the lengths of L1, L2, L3, L, and the Y. 2. Weigh the rod, W1, and W2. 3. Record this data 4. Find the θ , which is given by the equation, θ = tan^(-1) y/x. 5. Once you have done this then change some of the values and repeat the experiment.
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Unformatted text preview: 6. Afterwards calculate the percent error. Data and Calculations: Data Case 1 Case 2 ( θ degrees) 52.84 52.84 L (m) 0.57 0.57 L1 (m) 0.32 0.37 L2 (m) 0.51 0.51 L3 (m) 0.47 0.47 W1 (kg) 0.15 0.15 W2 (kg) 0.15 0.15 Wrod (kg) 0.13367 0.13367 W (calculated) 0.434 0.454 W (experimental) 0.41 0.45 Discussion: There were several opportunities for error to occur. The biggest reason for error is human error. When the objects were being massed, it may have been misread or the scale may have not been zeroed. The lengths may have been measured incorrectly causing there to be a slight error. Conclusion: However in this lab our error was very minimal. In the first case our percent error was 5.53% and our second case had only .88%. If we had to do this experiment once more, we would make sure to zero the scale and make sure that the measurements are accurate. However, my group is extremely pleased with the results, which were extremely close to perfect....
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## This note was uploaded on 02/12/2011 for the course PHYS 111A taught by Professor Universal during the Fall '10 term at NJIT.

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LAB 121 - 6 Afterwards calculate the percent error Data and...

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