Inspiration
This week was almost completely improvised at the last minute, starting with a memory of an oil & water wave machine jar from cub scouts. From there I moved to density/buoyancy object tests and predictions.
Materials
Various balls and objects for sink/float tests
1 Glass jar with tight fitting lid
1/2 a jar worth of oil
Water for the wave jar and the sink/float tank
Food coloring to create better contrast in the wave jar
Notes
We started by mixing the food coloring & water and making some predictions about what would happen when we added the water (they went with the oil sinking because it was thicker). We talked about why they stayed separate for a while though I don't think that sunk in while they were exited about making waves and turbulence. The discussions about density being the reason that the oil floated went well and we dropped the various objects in the water after making fairly successful predictions for each. Later this experiment would tie in nicely with the gravity experiments where we reinforced the concept of density.
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| Forming a hypothesis. |
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| Hypothesis crushed but still fun. |
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| Lana, pretending her head is like the sinking ball. |
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| Noelle showing the contrasting density for two similar feeling bouncy balls. |
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| They made note of how much of each floating ball was sticking out above the waterline. |
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| We started to branch out a bit beyond the balls in the toy bins. |
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