PURPOSE: To demonstrate inertia of rest.

DESCRIPTION: A spring is pulled back and released, flipping the card away so that the steel ball falls into the cup. A small flat has been filed onto the ball so that it will rest in position on the card.

SUGGESTIONS: This experiment is useful only for small groups.

REFERENCES:

EQUIPMENT: Stand with spring, card, and ball, as photographed.

SETUP TIME: None.

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