Tuesday, 19 June 2018

Mind Mapping DLO

Gravity

SMRF and READ this text. Then complete the following responses to text.


Highlight the main ideas. Summarize these main ideas  in one or two paragraphs.
 Gravity only becomes noticeable if one (or both) of the objects has a lot of mass, such as the Earth.,
Gravity is a force that attracts all objects towards each other.Gravitational attraction is greater for
more massive objects. Gravity decreases as distance between the objects increases.Every object
in the Universe is being attracted towards every other object by the force of gravity.there is nowhere
you can go in the Universe where gravity is not acting. Every object in the Universe is being attracted
towards every other object by the force of gravity.Gravity doesn’t disappear just because you are above
the atmosphere ,


Isaac Newton worked out that, if the distance from the centre of the Earth doubles,

gravity becomes a quarter as much as it was on the surface.Any two masses are attracted

towards each other by gravity ,At an altitude of 30 km, you would be above 99% of the Earth’s

atmosphere. To stay in orbit a satellite needs to be horizontal to the Earth and have enough speed t

o stay in orbit. Satellites that are closer to the earth need to be traveling faster than the ones further

out in space. Astronauts in the ISS seem weightless because the ISS and the astronauts are falling

at the same rate as they orbit around earth.







  • When does gravity decrease? Gravity decreases when two objects get further apart.


  • When does the force of gravity become noticeable?


  • Gravity disappears when you are above the atmosphere. True or False?


  • According to the text, how long does it take the International Space Station (ISS) to
  • orbit Earth?


  • Who first stated that all objects are attracted towards each other by gravity?


  • Find six words in the text that have a suffix.

Gravity

Gravity is a force that attracts all objects towards each other. People are attracted towards

the Earth and the Earth towards people, the Moon and the Earth are attracted towards each

other, and the Sun and the Earth are attracted towards each other. All of these attractions

are caused by gravity. Gravitational attraction is greater for more massive objects. Gravity

decreases as distance between the objects increases.

Gravity attracts all things towards each other

Every object in the Universe is being attracted towards every other object by the force of gravity.
This means that there is nowhere you can go in the Universe where gravity is not acting.
Examples of gravity in action:
  • Gravity holds the atmosphere in place around the Earth.
  • Gravity keeps people on the Earth’s surface.
  • Gravity keeps the International Space Station in orbit around the Earth.
  • Gravity keeps the Moon orbiting around the Earth.
  • Gravity keeps the Earth orbiting around the Sun.
Isaac Newton was the first to come up with the idea that all objects are attracted towards each
other by gravity. Even people are attracted towards each other by gravity, but this force is so
small that it is not noticeable. Gravity only becomes noticeable if one (or both) of the objects has
a lot of mass, such as the Earth.

There is gravity in space



Earth-Moon system and gravity
Any two masses are attracted towards each other by gravity. This force of
gravity causes the Moon to change direction to make it orbit around the Earth.


Gravity doesn’t disappear just because you are above the atmosphere. Even if an
object is high above the Earth’s atmosphere, there will still be a strong force of
gravity pulling it towards the centre of the Earth. At an altitude of 30 km, you would be
above 99% of the Earth’s atmosphere. At 100 km, you would officially be in space, yet the
weight force of gravity would still be nearly the same. You and the Earth would still be pulled together.


Isaac Newton worked out that, if the distance from the centre of the Earth doubles, gravity
becomes a quarter as much as it was on the surface. A satellite with a mass of 1000 kg has a weight
force of 9800 N at the Earth’s surface. The radius of the Earth is about 6366 km, so at 6366 km
above the Earth’s surface, the distance from the centre of the Earth will have doubled. The weight
force pulling it towards the centre of the Earth will now only be a quarter as much but will still be 2450 N.


So why doesn’t a 1000 kg satellite just fall back to Earth?


Sideways speed keeps satellites in orbit.

As a satellite moves around the Earth in a circular orbit, the direction of the force of gravity is
always towards the centre of the Earth.
At an altitude of 100 km, you would be so high that you would see black sky and stars if you
looked upwards. If you took a satellite to this height and released it, it would still fall towards the
Earth because the force of gravity is nearly the same as it is at the Earth’s surface.


However, if the satellite is given speed in any direction horizontal to the surface of the Earth,
it will travel further before it hits the Earth. If it is given enough speed, it will travel so far that, as it
curves towards the Earth, it will miss the Earth altogether. At just the right speed, it will move around
the Earth in a circular motion. This type of motion and the path that a satellite moves in is called an orbit.


Close to the Earth at an altitude of 100 km, a satellite needs to be moving at 8 kilometres per second
(28 000 km/h) to stay in orbit. At higher altitudes, satellites do not need to be travelling as fast.
Television communication satellites are at a higher altitude of 36 000 km and only need to travel at
3 km/s (11,000 km/h).


The Moon is 360,000 km from the Earth and only needs to be travelling at 1 km/s to stay in orbit
around the Earth.


If there is gravity in space, why do astronauts appear weightless?
Astronauts appear to be weightless for the same reason that a person on a trampoline
feels weightless when in the air. There is still the same amount of gravity acting, but there
is no floor pushing upwards on the astronaut, so the weight force cannot be felt.


If a person was in an elevator and the cables broke and the brakes failed (we
are assured this cannot happen), the person and the elevator would fall towards the
Earth at the same rate. The floor would not be holding the person upwards, so the person
could enjoy the sensation of weightlessness (for a brief while).


This is the same for astronauts high above the atmosphere on the International
Space Station (ISS) at an altitude of about 400 km. Gravity is still strong,
but the astronaut and the ISS fall towards the ground at the same rate.
They are also both travelling horizontally at 28,000 km/h. As they
fall towards the ground, they travel so fast horizontally that they miss the Earth altogether and
orbit the Earth once every 90 minutes.

Nature of science

Science ideas change over time. Isaac Newton’s gravity-based world view has since been
superseded by Albert Einstein’s ideas that all masses distort space and time. This highlights
the fact that science is not a fixed body of knowledge. Although Einstein’s theory is widely accepted,
Newton’s law of universal gravitation is still used for practical situations such as satellite motion.



Planet Strange

Planet Strange
Success Criteria: We will have met the learning criteria when we have effectively
used the key structural features and key language features  of a narrative science
fiction text to tell our story.

As we circled an unknown planet, dark, black clouds glistened with
lightning strikes that hit every second. BANG! POW! POOF!  I was the
captain of my ship. I had to make the decision of going onto this planet
or not, it could be our last chance.


My ship was gleaming like the sun because of the silver, glossy coating
on the titanium metal. The hull was the colour of silver with bits of blue
around the cockpit representing we were from Earth. The thrusters as
big as an elephant and as powerful as a rhinos stampede.
Climate change on Earth meant we had to abandon it and every one was
put into Robot AI to survive space. Everyone  looked mainly the same
just different colors, our heads were rounded with one eye. I was the
colour of yellow with wires in my neck. I had four other crew mates or,
as they liked to be called, ‘adventurers’.


I ordered all my crew mates to  there stations.
I said to Mik, “Go to the control panel.” His blue eyes flickered like a
broken light bulb. “Yes captain,” he replied with a little chuckle as he
should really be the captain in command.
I told our robot dog companion and crew mates, “Get to your seats
and get the dog to go to his dog house.” They all moved as quickly
as possible, all there eyes flickering different colours. His dog house
was like a castle with a little watch out and the whole thing was made
out of metal and the colour of a dark green to make him feel like he was
in the centre of a forest.


I had made the decision to go onto the planet as I pushed the throttle
forward every one leaned into the seats slowly. The ship thrust towards
the planet 3 2 1 BANG !!! We went flying into the storm that was glistening
with lightning strikes. Every one jiggled like lighting . BANG !!!! We all
stared seriously as we broke through the cloud Connor tapped my
shoulder and said, “We have finally found a new home.” Everyone yelled
, “Hooray!”

I changed the mod into landing mode as we landed with a bang.
I opened the shiny door and it slowly went down as I stepped outside
into the wildness. I saw trees so big they were like the size of three
buses. Then my eye caught something. There was some moss that
had some little blue mushrooms. I raced over to them and touched it.  
It jumped up onto my shoulder as quickly as lightning and it had two
arms and two legs. They were a darkish grey with green eyes that lighted
up then went dark and they kept doing it.


Then it said something slowly and quietly.
“They are coming, “
I asked the little creature, “What are coming,” he said, frightened.
“The Asrocks.”
I ran as fast as a zebra to the cockpit were the crew were all chatting
about how nice the planet looked.  I yelled at them, “ Grab things to
cover the ship!” They all said in a panic, “Yes captain!”

They ran like lightning to grab things to cover the ship. Two minutes
later they were all inside exhausted.
“Why do we have to cover the ship?”  I was afraid.
“There was a little creature that said  the Asrocks are coming.”
James asked as his eyes twitched,“What do you think asrocks are?”
I said quietly, “I don't know.”  
We all listened, not saying a word, not moving at all. We were all standing
as steady as a cheetah waiting for it’s prey.


There was talking outside, a different language to us.
Then there were weapons of some sort fired.  
The shots of the weapon echoed through the forest then
became quieter and quieter until they disappeared.


Hours later we opened the silver, glossy door and outside was
havoc! There were holes in the trees that were still hot where
they had been shot. There were footprints two times the size
of our faces. There were little drops of blue blood tracking into
the bush.  I didn't say anything to my crew mates. I chased after
it hoping to find a Asrock or two there was a weapon on the ground
I picked it up it was as light as a feather there was something in the
bush It ran at me. I pulled the trigger on the weapon.


It didn’t shoot in stead in turned into armor and then pulled out this
cannon I shoot it Pow! The Asrock turned into stone. I looked at myself
there was another cannon Pow! It put a hole right through the stone it
was the same type of shot that had been in the tree. “This is amazing!”
I said to myself I ran to the ship I paused there was a dead robot on the
ground with a hole straight through its body It was james one of my crew
mates. I sneaked into the ship slowly and steadily BANG POW!! I shot the
two Asrocks straight through the chest.  My Crew mates were cuffed up I
shot the cuffs they blew to smithereens I asked what happened.
They said “The asrocks shot james and were going to execute us”
It Is going to be alright” I said. Three months later there was only
mayhem and death.



Thursday, 22 March 2018

Treaty Of Waitangi

This is a booklet about the treaty of Waitangi and we had to fill it out. 

Wednesday, 21 March 2018

Friday, 16 March 2018