# Lab 9 report.docx - Lab 9 Parallel Forces and Torque...

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Lab 9 Parallel Forces and Torque Danielle Williams (Tiffany Lee) PHY 123 SEC 008 10/29/14 Introduction
Danielle Williams 1 The purpose of this experiment is to study the conditions to achieve static equilibrium. We will familiarize ourselves with the principles of moments by investigating the moments of parallel forces. Calculations of equilibrium will be performed in order to describe the relationships observed in this lab. The different variables and combinations to be observed in this lab with help conceptualize and understand parallel forces and torque much better. Experimental Procedure Verify the sum of counter-clockwise moments equals the sum of clockwise moments when the external forces acting on the meter stick are in static equilibrium. Part I: Find the center of mass, hang a 50g mass on the 10cm mark of the meter stick and record the distance of the mass from the pivot position. Then, find where to place an 80g mass on the other side of the pivot to balance the meter stick. Remove all masses from the exercise you just did. Place two 50g masses about 10cm from each other on one side of the pivot and hang a 90g mass on the opposite side of the pivot to help balance the meter stick. Record the distances of the masses from the pivot.