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Work and Energy - PHY 221 Lab#1 Introduction to...

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PHY 221 Lab 7 ° Work and Energy Leader: Critic: Scribe: Goals : While F = m a may be the most important equation you learn in your first physics course, the concept of energy may be the most important idea. Energy is a quantity characterizing a physical system that keeps the same value ("is conserved", in physics terminology) throughout a variety of transformations. In this lab, you°ll examine a few examples where the concept of energy helps you see some surprising regularities in mechanics problems. You°ll start by working with concepts called work and kinetic energy . Then, you will investigate gravitational potential energy . Materials: PC with ULI interface for measuring instruments PASCO Motion Sensor Force Probe PASCO cart on aluminum tracks with bracket to fix the force probe on the cart PASCO cart without the mounting bracket Two rectangular weights for the cart Balance to measure masses Light spring Mounting rods and fixtures Activity: 1. Work and kinetic energy for moving cart Page 1 of 11 PHY 221 Lab #1: Introduction to Measurements 12/28/2009 http://physics.syr.edu/courses/PHY221.07Spring/manuals/work-and-energy.html
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Work is something that can be measured with the instruments you°ve become expert in using this semester in PHY 221. Since work is the integral of the force applied to an object over the distance of force application (integral of ), you just need to measure the force applied to an object ( F ) and the distance over which the object moves ( s ), and then be able to numerically evaluate the integral. These measurements you°ve already learned to make with the force probe and the sonic ranger. It turns out that the Logger Pro software is also capable of evaluating this integral too. Start out by using a setup similar to one of those from last week, a cart with a force probe bolted on top. Set the cart with the force probe on the track, with the hook of the force probe facing away from the sonic ranger. The force probe should be set to 10N range. Wake up Logger Pro with the shortcut to week7. Make sure that sonic ranger can detect the cart all along the tracks. Attach a light spring to the force probe hook. You will be pulling on the other end of this spring to exert force on the cart that will vary smoothly with time. Zero the force probe. Grab the spring, without applying any force to the hook yet. The cart should be at rest. Start collecting data. Stretch the spring applying a force to the cart. The cart will start moving. After about half way along the track release the spring from your hand and let the cart move freely. Practice recording clean data. Make sure that the force probe cable does not exert forces on the cart° (one of you may help the cable follow the cart without any obstructions). The recorded force should be initially zero, then it assumes some positive values, finally it becomes zero again when you let the cart go freely. Once the cart moves freely it should have constant velocity that will show up as linear dependence of the cart°s position on time.° ° Copy graphs of Position vs. Time, Force vs. Time, and Force vs. Distance into the report.
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