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Lab 121

# Lab 121 - 6 DISCUSSION The percent error in this experiment...

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LAB 121 Mehar Ghei LABORATORY EXPERIMENT REPORT Name: Mehar Ghei Group Members: Nicole Tran, Yvonne Chen, Nakib Junayed Experiment Date: Tuesday, November 23 rd , 2010 Course Name: PHYS 111A Section: H01 Instructor: Beidi He LABORATORY #121 Forces on a Strut 1. OBJECTIVE To determine the tension on the supporting cord and a strut by taking torques about the pivot point of the strut. 2. THEORETICAL BACKGROUND = * τ r F = * |τ| |r| |F|sinθ When a body is in rotational equilibrium, the sum of the torques equal zero. = τ 0 3. EQUIPMENT The equipment used for both parts of this lab: - Rods - String - Masses - Pulley - Hangers - Ruler Page 1 of 2

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LAB 121 Mehar Ghei 4. COLLECTED DATA Case 1 Case 2 θ degree 47.2 ° 47.2 ° L (cm) 57.4 57.4 L 1 (cm) 47.0 57.4 L 2 (cm) 32.0 32.0 L 3 (cm) 42.0 42.0 W 1 (kg) 0.15862 0.19832 W 2 (kg) 0.10369 0.11913 W rod (kg) 0.1136 0.1136 W calc (kg) 0.4554 0.5990 W esp (kg) 0.4425 0.5489 % Error 2.83% 8.36% 5. CALCULATIONS (All Calculations are on attached sheet)
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Unformatted text preview: 6. DISCUSSION The percent error in this experiment is fairly small because the weights and lengths have to be as precise as possible or else the system will not be in equilibrium. The percent error would have been smaller if there was more of a variety in smaller weights, which would allow the student to reach a more precise mass. 7. CONCLUSION I calculated the tension by equaling all the torques to zero, as the system is in equilibrium. There is a torque due to the string, due to the mass of the rod, and the masses hanging on the rod. Since the only unknown is the tension, it can be easily calculated and in turn, I can calculate the amount of mass needed on the other side of the pulley to maintain the equilibrium through Newton’s second law. Page 2 of 2...
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Lab 121 - 6 DISCUSSION The percent error in this experiment...

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