Cork float accelerometer: Cork and water in sealed flask.

The Cork Float Accelerometer. A light cork floats in water contained in a glass flask. A string connects the cork to the rubber stopper at the bottom. As the beaker is pushed forward or backward, the cork surges forward or backward. Cork moves in the same direction as the motion of the flask.
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This is a great demo, especially for small children, because the motion is the opposite of what is expected. Consider asking them what direction they feel pushed in a car as the car speeds up and slows down then having them predict which direction the cork will go. As always when you present a demo make sure you ask the participants questions before you demonstrate and after. Think about the concepts involved beforehand; having a friend ask you questions about it can be very revealing as to if you understand it well or not. Whenever you ask a question count to five (or at least three) in your head waiting for an answer before you stay anything else.