Listen to poem:
Pendulum Swings On Potential
Pendulum swings high, swings low, swings high, up.
A pendulum stopped, needs a push or pull
like a child wiggling to go in playground.
Push me, pull me, push me up, till I fly.
Once started, gravity sustains the swing.
going high, gravity tugs and pulls down.
As it falls tethered on string, speed builds up
carrying it down, then up high, until
Gravity's elastic drag stops the up.
The pendulum weight hangs floating and poised,
before it free falls on string to swing down.
The pace is fast at first, then slows right down.
Potential gained by the elevation
sustains the swing's perpetual motion.
But friction's drag spoils the fun of swing,
otherwise the pendulum would swing up
down, up and down, up again forever.
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