We performed an experiment with Bob. We released the bob and observed that it swung nine times in thirty seconds. Second we put a 500 gram weight in bob and he got heavier and it still swung nine times again. Then we put 1000 grams (1 kg) in bob and we swung him for thirty seconds and he swung 9 times! Wow! I noticed it is the same no matter what. Afterwards we had bob with no weight. We swung bob for thirty seconds. We started up higher and he still swung 9 times! Finally we made it shorter and put 500 grams and bob swung eleven times. Bob's experiment had the same number of swings until the last time.
by Z'Aira
We performed an experiment to change the motion of a pendulum. First we released bob and observed that it swung nine times in thirty seconds. Then we make bob heavier and bob swung nine times still in thirty seconds. After that we made bob 1000 grams heavier (again) but we took the other weight out but it went nine times again. Fourth we changed bob again and same thing! Still nine times. Finally we made the string shorter and...it went eleven times! The only way thing we could do to change it was making the string longer.
by Maya
We performed a pendulum experiment. First we released the bob and observed that it swung nine times in thirty seconds. Second we changed the weight to 500 grams and released the bob and observed it swing for nine times in thirty seconds. Then we changed the weight to 1000 grams and released the bob and observed it swung nine times in thirty seconds. I do not think the weight matters. Afterwards we changed the height of the bob with one weight and I observed that it swung nine times in thirty seconds again. Finally we put the bob up and put 500 grams in it and released him and observed that it swung eleven times in the thirty seconds. I observed that it swung eleven times when it was shorter.
by Addie
