Beginner Needing Help with Vector Physics Lab

AI Thread Summary
To analyze the pulley system in the physics lab, start by calculating the forces acting on the system using the readings from the spring balances and the angles provided. The weight of 150 g should be converted to Newtons for calculations, and the forces from the spring balances must be resolved into their horizontal and vertical components based on the angles measured from the horizontal. Ensure that the sum of the vertical forces equals the weight of the hanging mass, and the horizontal forces should also balance out to zero. The angles should be measured from the horizontal, and the calculations involve vector addition to confirm equilibrium. Properly setting up these calculations will help determine if the lab was conducted correctly.
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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