Wednesday, 18 December 2013
Saturday, 7 December 2013
How Does It Happen?
Bucket Experiment
On Tuesday Hoiho class did Jacob's
Wonder Brick. The Wonder was "How does water stay in a bucket when you
swing it around?" First we got some people to swing the bucket around with
the water in it.
Patrick and Aria got a bit wet because
the bucket hit their leg when they were swinging it around.
The water stays in the bucket because
the water swinging around in a circle gets a force, which makes the water want
to fly outwards. If you swing the bucket around fast enough this force will be
greater than the force of gravity so it won’t
spill.
By Lawson and Sam
The amazing water and bucket trick!
On Tuesday, Hoiho went outside to do a "bucket" experiment. We filled the bucket up about half way with water, and if you spin the bucket around your head so your arm just touches your ear, the water will not fall out!
The water stayed in the bucket because of centrifugal force. The bucket is what stops the water from flying outwards. Without the centrifugal force, you would expect for the water to fall out of the bucket because of gravity!
(Phew, thank goodness for centrifugal force!) But if you fill it to the brim, some of the water will come out while you are getting it up to speed!
By Finn, Patrick, and Josh.
Friday, 6 December 2013
Monday, 2 December 2013
Thursday, 28 November 2013
They're Growing
After two weeks the beans have grown to between 30 and 40 cm and they have started climbing up the poles!
Monday, 25 November 2013
Friday, 22 November 2013
Monday, 18 November 2013
Sunday, 10 November 2013
Friday, 1 November 2013
Thursday, 31 October 2013
Wednesday, 30 October 2013
Friday, 25 October 2013
Thursday, 17 October 2013
Wednesday, 16 October 2013
Tuesday, 15 October 2013
Monday, 14 October 2013
Friday, 27 September 2013
Wednesday, 25 September 2013
Tuesday, 24 September 2013
Tuesday, 17 September 2013
More About Pulleys and The Extra Hand
Lots of machines have pulleys in them for example a cage
that pulls you across a river. David
You use pulleys when you are sailing. It makes it easier to
pull the sails up. You also use pulleys on cranes to lift up heavy objects like
big containers. Also on flying foxes you connect the pulley to the wire. And
with flags you use the pulley to raise the flag. Ben
You can find pulleys on cranes, garbage trucks with claws,
big boats, sail boats, ski lifts, drawbridges, flag poles and bikes. Margeaux
Today we had a big argument about where the weight goes when you pull the weight up with the pulley. First Ben said half the weight goes to the beam. It does, so he was right. The beam acts like another hand. Patrick
We learned that the beam supported half of the weight and our hands supported the other half of the weight. Josh
The weight will be half the weight that it actually is. This is because the beam is acting like another person so it is halving the weight between you and the beam. Margeaux
Same Force
Without a pulley two people lifting a weight have to both lift with the same force for the scales to read the same. If one lifts harder than the other their scales will read higher.
With a pulley on the lifting string the pulley will make sure that both people lift with the same force.
Monday, 16 September 2013
Sunday, 15 September 2013
Dome Strength
We brainstormed strong 3D shapes on the whiteboard . We said that an arch was a strong shape, then we talked about where your weight would go if we stood on an arch bridge. We had a lot of ideas about where our weight would go but we found out that it went down the curved sides towards the ground.Then we demonstrated with our arms how strong a dome is with Jonty and Mrs Bryant pushing the top of our hands down. It was fun experimenting with domes.
By Ruby and Kimberly
On Wednesday 4th Hoiho class did a science experiment. What we did is we got four empty three quarter eggshells. We put two eggshells close together at one end and two at the other end in a rectangle shape. Then we started to put blocks on.
By Margeaux
Some people thought that the eggshells wouldn’t hold three blocks. We stacked the third block on the empty 3/4 eggshells. Finn, Jacob, David
We put on the 4th block and there was a loud CRACK! Everyone yelled and I said "That was close". And one eggshell was cracked now. By Patrick
Then we placed the tenth block on top of the ninth block. And the eggs didn’t break. Caleb
On the 14th block we heard a crack in an eggshell and it collapsed like the twin towers. By Margeaux
On Thursday we were writing like scientists about doing a forces experiment. First we did the title then the materials. After that we did the hypothesis. Then we did the procedures which took a while. Last of all we did the conclusion.
By Lawson and Sam
Thursday, 12 September 2013
Wednesday, 11 September 2013
Lifting With A Pulley
First my class saw Ruby using scales with a
metal lathe plate hanging on the bottom of the scales then her face turned red.
Suddenly Mrs Bryant said, “You can put it
down now”.
Then Ruby had a turn with the pulley. Mrs
Bryant asked, “Is that easier?” Ruby replied, “Yes”.
Suddenly Mrs Bryant told me to have a go. David
Pulleys make it easier to lift things into
the air. They are useful for lifting weights and heavy things. Today in class
we were lifting a metal lathe plate with scales and a rope with a pulley to see
which one was harder to lift. We found that it was harder with the scales. To
get the lathe plate the same height as it was with the scales you need to pull
the rope two times higher. Lawson
Lifting with the pulley is a lot easier than
lifting with the scales. Because the scales just tell you the weight and the
pulley is helping you to lift what ever you’re lifting. When you’re lifting the
pulley lift it two times higher than the weight moves. Aria
Pulleys make it easier to pull things up.
You have to pull it two times higher. Jonty
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