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A pulley is mounted six feet from
the ground on a stand. The 200 g weights are attached to
both ends of a long string which passes over the pulley. A
small 5g mass is added to one of the larger masses and this
combined weight is then placed on the drop plate at the top
of the Atwood device. This drop plate is controlled by an
electromagnet driven by a power supply on a momentary
switch. The acceleration is then observed over a vertical
distance of two meters and the time for this trip can be
measured by a stopwatch. An experimental value can be obtain
for the downward acceleration can then be compared to the
theoretical value.
Connect the power supply to the electromagnet at the top
of the stand. The electromagnet controls the starting gate
that drops the mass. Insert a momentary switch so that you
can control the starting drop of the mass. It also protects
the electromagnet from burning up.
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