lab 3 - Introduction and Theory There were three parts to...

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Introduction and Theory There were three parts to this experiment, a mass lift, a spring stretch, and a cart push. For each part of this experiment, one needs to understand the work-energy theorem which states that W= ΔK+ΔU where W is the work done, ΔK is the change in kinetic energy and ΔU is the change in potential energy. In each section either ΔK or ΔU is changed. In the mass lift, a mass was lifted a certain height at a constant speed, which made for no acceleration and therefore a constant force. In this situation work can be calculated using the equation W=F•s, where s is the total distance covered, F is the force, and W is work. Also, this equation is based on the fact that there is an increase in kinetic or potential energy, in this case potential energy is increased. Potential energy is calculated by the equation ΔU=mgΔh where ΔU is change in potential energy, m is the mass of the object, g is acceleration due to gravity, 9.8 m/s^2, and Δh is the change in height. Being that all the numbers on the right side of the equation will be positive, the potential energy change ΔU is positive indicating an increase which allows the aforementioned equation to work. If the force is not constant, then work is calculated graphically using the equation W=ΣF(s)Δs. In the equation the total distance covered is broken into small segments of nearly constant force Δs. The work during each segment can then be calculated using the
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This note was uploaded on 03/28/2008 for the course PHY 1 taught by Professor Sliwa during the Winter '07 term at Tufts.

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lab 3 - Introduction and Theory There were three parts to...

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