This was a
simple lab that helped me understand Archimedes’ principle when I had to
calculate the buoyant force on a can of sand when we put it in a container of
water. Using the formula P=F/A (or, in other terms, P=mg/A). We also used
P=pwgh. We used the information that we put in our graph (Graph #1)
to get the pressure. The main element we had to deal with in this lab was how much room
there was for error. We could measure the depth incorrectly, whether it was
just off, using the wrong units, or measuring the wrong part of the can (it
happens). The dirt ratio was not perfect for the small can to the large can. It
said to put dirt in it until the can was 3/4th under water, but
instead we had our small can around 7/8th under water and our large
can was about 3/4th under water. This difference could be the reason
for our 91% difference in the cans percentage difference (Graph #1, last
column). One
other mistake my group and I made was that we didn’t convert the weight down to
grams from kilograms, which made everything messy. Nevertheless, this lab was
very helpful in understanding buoyant force and the forces that push down the
can.
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