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Think about two objects you’ve encountered recently—one that surprised you by being heavier or lighter than expected. What were the objects? Why do you think their density made a difference? How does understanding density help explain everyday surprises like this?

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A bowling ball felt heavier than I expected because it is small but has a high density. An empty cardboard box felt lighter than expected because it is large but made of a low-density material. Density helps explain why an object's size does not always tell us how heavy it will be.

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A hammer felt heavier than I expected because it was smaller than I thought it would be, but the metal made it pretty heavy. A big plastic water bottle felt lighter than I expected because it was mostly empty and plastic is not very dense. This showed me that the size of an object does not always mean it will be heavier. Density helps explain why some small things can be heavy while bigger things can be light.

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a hammer and an empty garafon water bottle 

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A baseball and a guitar: A baseball was heavier than I had expected because it was smaller and looked like a normal baseball, but this one was more dense than a regular baseball. A guitar was lighter than I had expected because it looked a little bit more heavy duty, but it weighed less in density. Understanding density helps explain surprises like this by showing the the more density an object has, the heavier it is

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A Glass Water Pitcher felt heavier than I expected because it is small but it had a high density. A Guitar because it is large but it felt lighter than I expected because it is made of low-density materials. Density can help us in everyday life by explaining that you can expect some things that make sense but it might not always be accurate.