Beginner Needing Help with Vector Physics Lab

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Homework Help Overview

The discussion revolves around a physics lab involving a pulley system with spring balances. The original poster describes a setup where weights are attached to strings, and measurements of angles and spring balance readings are taken. The goal is to analyze the forces in the system to determine if they sum to zero.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster seeks guidance on how to set up calculations based on their measurements. Some participants question the reference point for the angle measurements, while others inquire about the method for summing vector magnitudes and considering the weight's effect.

Discussion Status

The discussion is ongoing, with participants exploring different interpretations of the angle measurements and the calculation methods. Some guidance has been offered regarding the angles, but there is no consensus on the overall approach to the calculations.

Contextual Notes

The original poster expresses uncertainty about the accuracy of their lab group's execution of the experiment and the calculations required. There is a focus on ensuring that all forces are accounted for in the analysis.

keishuu
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Hi! Can someone give me a general idea of how I do this?
In my lab today we a pulley system with two spring balances attached to a long sting. We had to do several configurations and measure the angle and record the reading on the spring balances. Could someone guide me as to how to do the calculations for this?
For example:
A 150 g weight was attached to the string
Spring balance reading string 1 (the magnitude I guess): 120g
Angle string 1: 65 degrees
Spring balance reading string 2: 20g
Angle string 160 degrees

I'm supposed to see if all the forces add up to zero. I'm not quite sure if my lab group did the lab right, but could someone please help me figure out the calculation setup for this. Thank you so much!
 
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Are the angles measured with respect to the vertical or horizontal, or what?
 
From the horizontal
 
Please help!
 
Do you add the magnitude of the sum of the vectors formed by the string and then the mass of the weight * acceleration?
 

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