# Prodecud

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• Publicado : 11 de enero de 2012

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PROCEDURE:

For this practical we use dan apparatus used for measuring the g constant, it consisted of two sensors in a stand clamp which cutted and restored the currentcreated by a power supply, the sensors held a metallic ball which was freed , when it was freed at the top.
The ball cutted the current of the circuit when released and whenit landed on a plate situated at the bottom it restored the current ,this elapse of time without current was recorded by an osciloscope and using the cursors of theosciloscope we could read the wanted time in the image. We threw the ball frome different heights to reduce the error and have a larger variety of results to compare.

Once werecorded the values of the osciloscope using the cursors we added the values to a table , calculating the mean value of time , the standard deviation and the errors.
The errorof the apparatus was of 0,004 s.

The results were then plotted into a graph , to compare the equation of movement to the equation of the line.

An approximation was madeto approximate to a curve of the plotted graph to the equation of movement. S=1/2at^2+ut.

The plot of the results gave us a best fitting line which aproximated to theequation of movement , so we had to compare the elements and the variables of the line , and compare them to the equation , this would give us that the gradient of the line is ½of the wanted value of g. And +ut would be the y intersect of the graph which should aproximate as much as posible to 0.

Y=4,891x+0.0342 = s=1/2at^2 +ut

-With this ,our calculation resulte on a quite aproximate value for g.

Y=4.6022 t^2 yo=0 m Vo=0 m/s

-So in the equation (½g=4.981 ) Δg=dg/dm Δm Δg=0.5

g=(9.8±0.5) m/s^2