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Monday, 3 July 2017

Science Blogs

Science Chair Pulley Week 4
This week I got to choose between three science activities, ping pong ramp, basketball bounce, and chair pulley. I chose to do the chair pulley because I didn't get to do last week because I was at reading. We made it with two chairs, some rope and a basket, it worked so we moved the chairs so one was on the top seat of the forum seating, and one on the floor, it still worked perfectly.

 I found out that there is friction on the rope because there are knots because the rope had split into 3 tiny bits, because of that it is harder for the basket to move, but I also learnt that it helped when we put the rope on a diagonal angle because the basket just falls back down. But if you put the end of the basket over the knot, when you pull the rope the basket hangs on the rope and doesn't fall off.

 I wonder if I made a chair pulley under water it would still work, or the basket would just float up to the end?

Science Rocket  Balloon Week 5
I got to choose between 2 activities because I was in Bali for the first day of science. I made a Rocket Balloon with Liam and at first it didn't go to well because the balloon popped twice because when I put the sellotape on the balloon when it was blown up it explodes in my face. After a while Shileen came and did it perfectly, she showed Liam and I how to do it. She put paper on the balloon and connected that to the straw on the string. We did the same and it worked but our thing was too long so the straw didn't reach the end.

 I learnt that if you put sellotape on a blown up balloon it pops. I wonder if our rocket balloon would work if we figured out how to connect 2 balloons so the balloon would go faster and get to the end quicker.

Science Catapult Week 6
Yesterday I made a new catapult in 15 minutes, Ollie and I were working together and we used the new catapult that I made. We had to put 1 rubber band on the cotton ball, see how far it gets, then you have to do the same till you get to 10. Once you get to 10 you have to put 3 cotton balls into 1 ball and fire that, then see how far that goes. 

I learnt that the more you power in the pull that you use on the catapult, the more power the catapult puts into the cotton ball, and if the cotton ball is weighted down it will go even further. 

I wonder what would happen if we used a small rock, because that could be heavier than a cotton ball.

Science Catapult Week 7
This week Ollie and I gathered data about the weight of cotton balls and how far the cotton ball could go if you added rubber bands. 

People say that the more weight you put on the ball the further it will go, but after 4 rubber bands, the ball was getting to heavy and wouldn't go as far.  So maybe if you put a cotton ball with 10 rubber bands on it and a cotton ball with 1 rubber band the distances for both would be close to each other. 

I wonder what the perfect amount of rubber bands Ollie and I would need to put to make the perfect weight, so it wouldn't be too much weight but not to light.

Science Catapult Week 8
What is force: Force is gravity pushing and pulling things, example: If I throw a ball, the force from my hand pushes the ball away from my hand.

This week at science Ollie and I carried on gathering data about how far cotton balls go with more weight on them, we also put rubber bands around 3 cotton balls and gathered data about that. We  had to make a graph about how far the cotton balls went with up to 10 rubber bands on them. 
We used a metre ruler to rule how far the balls went. 

Ollie and I changed how many rubber bands were on the cotton ball, and how many cotton balls we fired at once. When Ollie and I had finished the three cotton balls part we realised that they went further than one cotton ball, we think it's because the weight, because it started going less distance when we got to four rubber bands around the cotton balls. The first test for one ball was 1m 50cms and the first test for three balls was 2m 59cms. The 5th test for the one ball was 2m 5cm, three balls was 4m 57cms. As you can see the tests with three balls go alot further.

I learnt that the weight of the cotton ball doesn't really matter, it's how much you pull back the spoon, because Ollie and I had a ball with 3 bands on it and it went like 4 metres and 4 bands and 5 bands went horribly, but 6 bands went like 6 metres.

This learning makes me wonder about if it would be easier if the plastic spoon, was replaced with a rubber or a bendy material spoon, because there would be more fling, so there would be more force pushing the ball. If you pull the spoon back of the catapult, when you let go the spoon will fling forward and push the cotton ball away from the spoon. The cotton ball will eventually fall to the ground because gravity pulled it down to the ground.

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