Lecture 25, 4/14, 2008
Test 4, Tuesday 4/29, 6 p.m.

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16.1 Periodic Motion and Energy
Goal: Understand the fundamentals of
periodic motion
.
•
Periodic motion is any motion that repeats
itself. It is due to a continuous back and
forth conversion between potential and
kinetic energy in an isolated system.
Note: In reality, each of these conversions is
accompanied by some energy dissipation,
causing the periodic motion to die out.
This process is called damping. We will
act as if damping does not occur. We
cover damping in UPIII, since it requires
differential equations.

16.1 Periodic Motion and Energy
•
The time duration of a full cycle of periodic
motion is called the period, T.
•
Example: For an object in circular motion, the
period is the amount of time it takes to trace out
one circle.
•
The number of cycles completed in one second
is called the frequency,
f
. It is the inverse of the
period:
f
=1/T
•
The amplitude of periodic motion is the
maximum displacement from the equilibrium
position.

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