7-1369 Mass Force Inertia Ball and Card

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US$15.40
7-1369
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The 7-1369 Mass Force Inertia Ball and Card Demonstration unit graphically illustrates the inertia of an object.

Rest the plastic ball on top of the plexiglass square that is set on the vertical post. Release the spring and the square shoots out. The ball falls into the concave recession in the post, remaining at rest on top of the post as if nothing happened.