1. Stack quarter coins one above the other on a flat surface.
2.Hit one of the bottom coins with the edge of the spatula.
My moms explanation: Only the bottom coin slid out because when you hit it with the spatula fast enough you are only applying force to the coin you hit. This causes the coin to slide out and the rest remain unaffected because objects in rest stay in rest if not acted on.
My Critique: This is a good explanation because she used Newtons first law and this law directly applies to this demonstration. I would have mentioned coins are just sitting one above the other and when one of them is hit sideways, the ones in immediate vicinity resist that motion and the stack slide down under effect of gravity. But otherwise it is a pretty solid explanation.
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