This week, I chose the question "How do different surfaces affect the momentum of marbles?" I tried 5 different surfaces. Cement proved to provide the marbles to go the farthest, and thick carpet the shortest. I was going to try grass. I tried it about 5 or 6 times. With my yard as uneven as it is, nothing worked well! That is when I decided to change it to the asphalt slope coming from the road into the yard. This was different from my other floor choices seeing how it was sloped and thge rest were flat. One thing that was a problem for the surfaces inside my house was the objects and amount of space to roll the marble. My students would be able to do this experiement, but being second graders, they would definitely need more specific steps to follow as far as directions go. (That way there is less confusion and trouble!)
~8-O
Believe me, second graders like to talk instead of listen and then ask 12 times what they are supposed to do! I think a more guided experiment would be better for them. However, the students would have a much better understanding of momentum and friction by doing the experiment than memorizing definitions.
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