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Jorge Lopez
Partner:
Andy Rachlin
3/3/10
Jl9959
Experiment 3:
Force and Potential Energy
Introduction
According to Newtonian physics, if an object is in a potential setting then that object will
experience a force acting on it.
In this experiment a magnetic field was used by placing a
magnet at one end of the air track and another magnet at one end of the glider.
As the magnet on
the glider got closer to the other magnet, the repulsion between the two increased.
This means
that the potential energy increases as the distance between the two magnets decreases.
We
predict that as we put the magnets closer together, the potential energy increases and because of
this, the velocity of the glider will be greater.
Therefore as the distance between the two magnets
decreases, the kinetic energy of the glider will increase due to the increasing velocity.
After the
individual potential energy for each distance is found, then the graph of the potential energy
versus distance can be made and by using the bestfit curve the constants can be found to the
equation of potential energy
=
( +
)
Ux
m1 x m2 3
.
Then to find the magnitude of the force,
the derivative of U(x) can be calculated since the force is equal to the negative derivative of U.
To find the static force, a string over a frictionless pulley with mass will be used.
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This note was uploaded on 09/13/2011 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.
 Fall '08
 Turner

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