In no particular order, here are some photos from a sciencey demo I did at Sam's school, MSR, with my officemate John and his son. The focus was delivering the difference between ballistic motion (snowballs, your younger brother) and self-propelled motion (air planes, rockets). They really got it! At one point a plane flew overhead and they all pointed up and yelled, "SELF-PROPELLED!"
We demo'ed John's son Brendan's trebuchet first, using it to launch water balloons. Not at anybody. Discussed why they are better than catapults.
Then we moved through four different "rockets": rubber-band, air, water and chemical. We had two chemical rockets and shot each of them three times. Got lots of volunteers--everyone had a chance to pull a pin or press a button or chase a rocket. Fun! Gorgeous weather for it, too. Whole thing went 1.25 hrs, not including setup, or later when John and Brendan and I snuck back with a ladder to get onto the roof to retrieve the blue rocket.
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| John and Brendan discussing which rocket will go higher--the larger or the smaller |
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| In the center you can see the parachute and rocket descending |
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| Sam, about to fire the trebuchet |
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| Tim: "blah, blah, blah, science, blah, blah" |
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| Rocket #2. We donated this one to Sam's class. They decorated it nicely ahead of time |
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