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Lab 9: The Simple Pendulum, the
Physical Pendulum, and the Pursuit
of Buoyancy.
SAR Physics
A M Kolchin
The Purposes of this lab are to:
1. Verify an equation relating the period of a simple
pendulum to its length.
2. Verify an equation relating the period of a phys
ical pendulum to its rotational inertia.
3. Investigate how buoyancy
(a) reduces the apparent weight of an object.
(b) gave rise to the expression:
”....
and that’s just the tip of the iceberg.”
1
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The Simple Pendulum We saw in the second lab that
the period of the simple period depended only on the
length of the string connecting the mass to its pivot.
Now we’ll be more speciﬁc and state that the period
(
T
) of a pendulum is
predicted
to be:
T
pred
= 2
π
v
u
u
u
t
L
g
For each of the two simple pendula set up:
1. Measure the length
L
and record it in the data
table in
meters
.
2. Calculate the predicted period
T
pred
using the
formula above and record it in the data table in
seconds
.
3. Measure the time it takes for the pendulum to
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 Spring '08
 Staff
 Physics, Buoyancy

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