PURPOSE: To illustrate the center of mass in a surprising way.

DESCRIPTION: Q: How can you hang the hammer from the loop on the bottom of the hinged board so that the board will stick straight out horizontally? A: Insert the handle into the loop so that the head of the hammer is pointing back toward the hinge.

SUGGESTIONS: Let the students try it for a while before helping them to determine a solution.

REFERENCES:

EQUIPMENT: Hinged stick with clamp to attach to table, hammer, as photographed.

SETUP TIME: None.

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