PURPOSE: To show the surface of a container of water in a swinging pendulum.
DESCRIPTION: A container with water is suspended as a pendulum. When the container is held to one side, the water moves to its lowest point and the surface remains horizontal. When it is released and swings as a pendulum, the water spreads out uniformly on the bottom of the container and stays at rest at all times.
REFERENCES: (PIRA unavailable.)
EQUIPMENT: Water container pendulum with colored water, stand.
SETUP TIME: 10 min.
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