More Air Experiments

We did some more experiments with air last week. First we made a boat without a sail and tried to see how well it moved (in our bathtub). Then after adding the sail, saw how well we could move it. Talked about how the surface area of the sail gives the air more push power. Then we attempted to make a pinwheel wench (wind up) out of a cardboard pinwheel on a straw rotating freely around a dowell stretched between two clothespins. Our pinwheel wasn’t very uniform so it didn’t turn as well as we would hope, but we watched the video of the guy using his and could tell that ‘air can lift things’. 😉 Hehe.
Last, we made a balloon rocket attached to a straw that shot along a wire/string. Its really hard to see in the photo, but its about halfway to Nate and Benjamin. Hannah loved the fact that it would go “uphill”. We shot it multiple times.