Monday, 26 June 2017

Science Blog

Week 8 (Blog 2)

 What is Force?

Push is a forward force. Eg: Pushing your friend on the swing.

Pull is a towards force. Eg: Pulling the rope towards yourself.

Acceleration is when something gains speed. Eg: The car accelerated in speed.

Friction is what stops a moving object. Eg: Friction stopped the ball from rolling.

Gravity is what keeps us on the ground.

2) See

This term I made lots of rocket balloons. I made them with Libby, Charlise and Trinity.

How to make a Rocket Balloon:
Get a straw and cut it 10cm long.
Sellotape a balloon onto the straw.
Get a ball of string and cut it 3m long.
Sellotape one end onto something.
Then thread the straw with the balloon sellotaped on onto the string.
Then Sellotape the other side of the string to something else.
After that make sure the string is firm and at a 45 degrees angle.
Blow up the balloon to 19 x 25 cm.
Let go of the balloon and watch it travel down the string. 

The first time we made rocket balloons we just had a play to see if it worked. I did this one with Savannah and Brooklyn. We didn't get to finish making the rocket balloon.

The second time we had to stick to the same variables as everyone else. This time I worked with Charlise and Libby.

The third time we stuck with the same variables except we changed the length of the string to 3 meters. Trinity came and joined in with us this time.

The first 3 attempts on the fourth time we used the same variables. Then we got to change one thing each time we did it. First we changed the length of the string, then the size of the balloon.

3) Data

This is what we had to stick to the second time we made rocket balloons.
1 ½ meter string
10 cm straw
19 x 25 cm balloon 
45 degrees angle
Tension: Firm

To make the rocket balloons we used
A straw
A balloon
A protractor

The data we gathered was the time it took for the balloon to get from one end of the string to the other. We did this by using the timer on the iPad.

We changed two things.
The length of the string 
The size of the balloon

When we changed the length of the string and like the first three times the balloon didn't reach the end of the string. When we changed the size of the balloon it went spinning around the string.

I learnt how to tell the difference between push and pull forces. I also learnt that time and distance gives you speed therefore force. Eg: Greater force means greater speed which is measured as less time.

4) Wonder

Would the balloon still spin round the string if we gave it less air?

My activity used push force because the air inside the balloon pushed the balloon along the string. It also used acceleration because when we let go of the balloon the balloon will gain speed.

I can use what I learnt when I create my model of a playground. I can use it by showing how it uses force.

Week 8

What I've Done:
This week I made Bar Graphs. The first one was about how many letters are in our first names and the second one was about how many pets we have. We did these as a class.

What I Found Out:
I Found Out that you need to leave a space in between each bar to make it clear which bar is which.
I also learnt that there is a Y axis and a
X axis on a bar graph. The Y axis is the line that is vertical and the X axis is the line the that is horizontal and along the bottom.

What I Wonder:
Why is the X axis called the X axis?


1st Bar Graph 

2nd Bar Graph

I have told you this because it is Gathering Data and that is related to science.

Week 7

What I've Done:
Today I did Rocket Balloons.
I also made a Mini Golf Course.

What I Found Out:
When we blew the balloon bigger the balloon spun round the string.
When the balloon wasn't attached properly it flew off the straw.

You don't need a lot of push force to get the ball

What I Wonder:
Why did the balloon spin round the string?


Week 6

What I've Done:
I made a Ping Pong Ramp

What I Found Out:
The steeper the ramp is the faster the ball travels it does this because it's easier for gravity to get the ball to earth.

It will need to be nearly flat for the ball to go slow because the ball had better grip.

Sometimes the ball went off course. It went off course because gravity steered the ball and made it turn.

What I Wonder:
Why does the ball have better grip?

How did gravity make the ball turn?

Overall Statement:
Gravity can steer objects and make them go off course.


Week 5

What I've Done:
Today I made a Chair Pulley.

I also did Rocket Balloons. 

What I Found Out:
When you pull with hand and push with the other then the rope will move round in a circle pulling the basket towards you or away from you.

If you change the angle of the rope the balloon finds it harder to get to the top because it doesn't have enough air.

What I Wonder:
What would happen if the opposite person did the exact same hand movements.

What would happen if the angle went straight up.


Week 4

What I’ve Done:
Today I made a Catapult.

Today I did Balloon Rockets.

What I found out:
That more simple catapults can shoot as well as a complicated one.

I learnt that balloons can use force to go upwards as well as downwards.

What I wonder:
What would happen if a simple catapult was used on a battlefield. (One where you use your strength to shoot.)

What would've happened if our one worked.


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