PURPOSE: To demonstrate that the system is stable until the combined center of gravity moves beyond the end of the lecture table.
DESCRIPTION: Walk the plank slowly, until the system becomes unstable. A thin rubber sheet under the plank prevents sideways motion.
SUGGESTIONS: Try not to think about the sharks.
REFERENCES: (PIRA 1J40.24)
EQUIPMENT: Heavy (28 kg) wooden plank, small rubber sheet, and sharks, as photographed.
SETUP TIME: None.
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