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The included DataStudio file will automatically stop collecting
data after 3 seconds. Remind students to release the car about
a second after clicking Start.
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The energy account analogy is appropriate here. During
this experiment energy is transferred between the elastic,
kinetic, and dissipated (friction) accounts.
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The car must be placed such that the plunger is touching
the metal flap on the Force Accessory Bracket. Otherwise,
some of the elastic energy will not be transferred to the
kinetic energy account.
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Be certain the Motion Sensor switch (if applicable) is
on the cart or near setting.
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In the first data runs, all the elastic energy of the spring
is converted to the kinetic energy of the car. When the car
is pushing the friction tray, the elastic energy is moving
to the kinetic energy and dissipated (friction) energy accounts.
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The experiment could also be repeated by placing more mass
inside the friction tray. This would shorten the distance
of travel, since the frictional force would increase. However,
the normal force would increase proportionally and the coefficient
of kinetic friction would remain constant.
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