A student experimented with pendulums to understand how a grandfather clock works. They attached sinkers to strings and pieces of wood to create pendulums, then timed how long it took for the pendulums to complete 10 swings. Adding more weight to the pendulum sped up the swinging rate. Through this experiment, the student learned that grandfather clocks keep time accurately based on the consistent pace of a pendulum's swinging motion.

1. How a grandfather clock
works

2. First we got a sheet
from mrs Hansen to
work out about how a
grandfather clock
works

3. The sheet told us
to make a
pendulum by
attaching a sinker
to a piece of string
which was attached
to a piece of wood.

4. We timed the time it took the
pendulum do ten full swings.
At the start it took about 12.75
seconds.

5. Then we attached
another sinker and
timed it.
This time it only
took 9.79.
Thats about a
second a swing.

6. We worked out
that a grandfather
clock works by a
pendulum swing at
an exact pace and
time.

7. Thanks for watching
BYE