Sunday, 2 July 2017

Science journal 9

Science journal 9

This week we observed the slingshot rocket, angle launcher and flipping frogs. We noticed for the slingshot rocket when you fire it you have to flick your wrist down als


What I go hard ato that the rocket uses elastic potential energy. We inference using clues that if we didn't flick our wrist down then it would've hit the stick and be blocked. 


We noticed that the flipping frogs also use elastic potential energy and that different designs went higher than others.

I think that this happened because of the shape and condition of the frog along with how tight the rubber band was.


We noticed at 45° angle the projectile went around 90cm with the launcher we used.  45° is the angle with the furthest distance compared with all the other angles. It moved faster on the ground than what it did in the air. This is strange because the ground has a rough surface, and also using my prior knowledge, on the America's Cup they describe the speed with how much fly time they have.













Thursday, 22 June 2017

What I go hard at

 Football is what I go hard at

We arrive, it's the worst day of the year, and the ground is soaking. It is so muddy, you can hardly dribble the ball, the ball gets stuck in the mud! This just has to be played.
The reason we still had to play, was it was the last game, I was glad because it was going to be really fun playing in this condition! We run  on the pitch the crowd is roaring. We slip slide sprint and fall.
The first shot of the game was from me it was very slow because it had to go through a big fat muddy puddle.
It sprayed mud all over the place,the goalie did not really want to dive in the puddle so instead he did a kind of  jig!
The ball snailed past him and straight in to the net I didn't even curve it, that is what you call skill!
For the rest of the game it goes on how it stared rain rain ☔️ rain goal goal goal the game finishes at 12 -3 with my team on top, I Scored 3 of our goals and my friend scored another 3 and our best player scored 5 the last goal was scored by a guy called Kai.


That is what I go hard at !!!

Science journal week 8

Science journal week 8
We have been working with projectile throwing catapults. The two catapults we have been working with are the trebuchet and the onager. Although they are different catapults there are lots of things the same and lots of things are different.

The power the trebuchet uses to work is gravity.  The weights drop and the arm flies over making the projectile (tennis ball) shoot. And then there's the onager which has a force of twisted rope power to work. When you twist rope up it spins and unties really fast this helps the onager’s power. This power is called torsion power.

Although the trebuchet has a longer arm than the onager the onager fires higher, but the trebuchet fires further. The trebuchet flies further because the trebuchets arm is higher than the onager and the trebuchet is double the size of the onager.

I think the onager might let go sooner than the trebuchet another reason is because the onager goes faster.



Because the onager flies a lot higher than the trebuchet and the trebuchet flies a lot further.











Overall the onager would be most useful shooting over walls but the trebuchet w
ould be more useful shooting

Science journal 5

science journal 4 (trebuchet and onager)
This week we did observed the trebuchet and onager, but we put in more weights in the trebuchet, and put the stick further down for the onager. We had to observe the difference between the two types of catapults. I noticed that the onager flew a lot higher than the trebuchet but it didn't go as far. I think that the onager goes higher than the trebuchet because it let goes sooner than the trebuchet. Another way I think the onager travels higher is because of the way it fires.
I think that the trebuchet fires further than the onager because it lets go later and it much bigger than  the onager we are experimenting on.    

Science journal 4

Week 4 catapult

This week we are experimenting and observing with a trebuchet which is a type of catapult. We observed how the trebuchet worked. With the trebuchet, it works a special way, the bucket holds wait and it has a little leather pouch which has a projectile in it, you pull the string which is attached to the weights and it launches the projectile. The more weights you put in the more the projectile went. I wonder what would happen if we put 20 weights in, I think it would go to the end of the field.
I think I am the same on the rubric

Science journal 3

Week 3 Balloon rocket (with change)
This week we used fishing wire instead of string, I think it spun a lot
more and moved a lot slower than what it did with string because of the friction. The forces I saw was thrust from the air coming from the balloon, push also from the air and drag from the air around that the balloons pushing on it. The learning of this is: noticing the difference between string and wire, and plus we drew a table of what we saw each time. I think that I am the same on the rubric.

Science journal 2

Week 2 balloon rocket

In week 2 the experiment was to create a balloon rocket. We did this by tying a piece of string between 2 chairs, threading a straw through the string, and then taping a balloon to the straw. We blew the balloon up and wa-la!
The balloon made it to the end two out of three times with half of the air remaining in the balloon I think the drag was very strong because because it didn't go fast it just spun! The distance the balloon traveled is 5m, it got to the end in 1.68 seconds I wonder if the more it spins the slower it goes! I think I'm in the same place on the rubric.