Learning about inertia and physics doesn't have to be overly complex. You can use these spinning marble tops to help you understand inertia.
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Replying to @Owen More marble fun and how Saturn got its rings #physic, Saturn
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Easy Inertia Experiment for Kids
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MindWare Mega Marble Run 215 Piece Elevator Building Set - Includes 200 Track Pieces, 40 Marbles Plus Motorized Elevator : Toys & Games
Law of Inertia Experiment for kids using a Fidget Spinner!