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Wednesday, 17 May 2017

Science Journal


Week 1: Starting to think about science: Gathering and Interpreting Data.
After today's slime experiment on Mr Anderson, I placed myself on relational for gathering data and inferencing because I observed how some of the slime was liquid and the rest of it was thick and chunky. This means that the secret is to have enough water and not too much cornflour.


Week 2: Balloon Rocket experiment
After our balloon rocket experiment I observed and inferred how the balloon could travel upwards on an angle. From this I observed the balloon could travel upwards because the air is trying to escape quickly. I wonder if my inference was correct. 


Week 3: drag - balloon Rocket experiment
When we put a piece of paper on the front of our balloon rocket, I observed how the balloon traveled smoothly across the fishing wire, but it was only a small piece of paper. When we did the same experiment with Mrs Pageot just with a bigger piece of paper the rocket didn't move. I think the balloon and paper crossed the fishing wire smoothly because the piece of paper had no effect..


Week 4:Trebuchet
This week we made observations on a trebuchet. I observed when we had eleven led bars in the
counter weight the projectile didn't go as far as having nine led bars. I think this happened because the counter weight to come down quickly. Another observation I made was that  thirteen led bars with a heavier projectile went further than thirteen led bars and a lighter projectile. I wonder how big trebuchets can get.
My data gathering is relational because I'm confident my observations are correct.
My inferences are relational because my inferences are correct.





Week 8: onager vs trebuchet 
This week we have been studying the onager and the trebuchet. We were writing down ideas about what is the same about them and the differences about them using a compare and contrast map. We recorded the distance of the ball or hacky sack and looked at the forces of the catapults. 

The similarities about the onager and the trebuchet is that they both use thrust. The trebuchet has a higher arch because it has a larger arm to throw the object in the sling really far. Where as the onager has a lower arch because it has a shorter arm than the Trebuchet. 

The onager has more velocity when you pull the string on it because it's torsion powered. Whereas the trebuchet has less velocity because it's gravity powered.

 In conclusion the trebuchet would be better for getting over castle walls because it has a higher arc because of it’s high arm. 


 Science experiments
This week we have been learning about elastic potential energy and angles (degrees). One of the experiments was a slingshot rocket and from this we learnt how to make one and what  design is better. I think popsicle sticks in a v shaped and a cut rubber band work together well because you have more elastic potential energy.

Another experiment was flipping frogs. In this all of the energy was in the elastic band. I think most of the experiment relied on the card because if the card bent the frog didn't work. 

We also had another experiment and that is u called angle launcher how it works, you pick an angle. The best angle was 45’ degrees you can choose short, medium or long range and then fire




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