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Hi Everyone,
It's me Sabrina!
Me and my class just finnished an experiment with catapults.
We wanted to do a controlled experiment so first we changed the size of the thing we are flinging. First we started out with a big foil ball and we saw how HIGH it would go. We did the same with the medium, small and tiny balls. We recorded the results to see it there was a pattern in the answers. We did the same with all of the balls but, to see how FAR we could fling them.
The variable that made the most difference for HEIGHT, was the tension on the catapult.
The vairable that made the most difference for LENGHT, was how far the catapult was sticking out of the launcher.
A controlled experiment is an experiment that is controlled. You would test your experiment, and to try to make a difference, change a variable on the next time you do the experiment. Then, you would do the next test but, change a diffenert variable and so on.
Sabrina
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