Orly's Room: February 2016

Sunday, February 7, 2016

Meet Bob

We have been investigating gravity by experimenting with a pendulum. The bob is the thing at the bottom of the pendulum that swings. Here's what we did:

First we swung Bob and found out that Bob swung 6 times in 20 seconds. Second we made Bob even heavier and we observed that Bob swung 6 times again. Then we pushed Bob harder and we observed that Bob still swung 6 times !!! Afterwards we shortened the strung and Bob swung 7 times. We observed that Bob swung one more time. Yes!!!!!!! Therefore I think that the only way to make Bob swing more is to shorten the string because when the string is short Bob will not have to go a long way.
by Alexandria

First we swung Bob and we found out he swung 6 times in 20 seconds. Second we put more weight and it was the same! Then we pushed it harder and it went 6 times AGAIN! Afterwards we made the stung shorter and it went more more time! Therefore I think that if you change the length of the string you can change how many times it swings because it has a shorter or longer distance to travel.

by Logan

First we sung Bob and we found out Bob swung 6 times in 20 seconds. Second we put more marbles in Bob to make it heavier but we observed Bob swung 6 times in 20 seconds again. Then we pushed it harder and we observed that Bob still went 6 times in 20 seconds!!! Afterwards we made the string shorter and it swung 7 times in 20 seconds. Finally!!!!! Therefore my claim is the only way to change how many times Bob swings is to make the string shorter. My reasoning is if you make the string shorter then Bob will swing more. I think this happens because Bob has a shorter distance to go.

by Tiffany