## Wednesday, 21 February 2018

### Force meter lab

lab experiment result

 object weight in air apparent weight in water buoyant force (weight in air-apparent pulley weight in air length of string weight 1 0.15 N o.1 N 0.05 N 10 N 40.5 cm weight 2 0.2 N 0.15 N 0.05 N 4 N 44 cm weight 3 o.25 N 0.2 N 0.05 N 1.2 N 24 cm weight 4 0.5 N 0.45 N 0.05 N 1.2 N 31.5 cm weight 5 1 N 0.8 N 0.2 N 1 N 32.5 cm weight 6 2 N 1.75 N 0.25 N 0.75 N 37 cm weight 7 2.15 N 1.85 N 0.3 N 0.5 N 44 cm weight 8 5 N 4 N 1 N 0.25 N 37.5 cm weight 9 10 N 8 N 2 N 0.2 N 28 cm

## Wednesday, 14 February 2018

### electric charge lab

Launch LabHow can you bend water?

1. Infer Why did you rub the balloon on your sweaterPredict what might have happened if you simply touched the balloon to your sweater instead of rubbing it.

Ans. When you rub the balloon against your sweater, the balloon will transfer electrons from the sweater, which make sweater have positive charge and the balloon becomes negative charge. If you just simply touched the balloon to your sweater, there are no charged transfer, so there are no friction occurs.

2. Key Concept Why do you think the balloon interacted the way it did with your sweater and with the stream of water?

Ans. because the charge is not equal; therefore, it need to make contact to balance itself. (equivalent)

## Wednesday, 10 January 2018

### mapping vector

Start point - M.201

East 6 steps
South 23 steps
East 14 steps
South 16 steps
West 37 steps
South 46 steps
West 15 steps
North 15 steps
West 18 steps

South 12 steps
End point Auditorium

## Thursday, 16 November 2017

### color lab

Lab activity on light

Activity a
1. r+g, r+b, b+g
2. work with another group—put a color paddle over flashlight, shine on white paper—so a red, a green, and a blue
Activity b
3. view white paper through color paddles—record results
4. view colored objects through color paddles

Materials
- Flashlight
- Red filter
- Blue filter
- Green filter
- Yellow filter
- Purple filter

so, in addition, it has 2 flashlights. R+G = White, R+B = White, B+G = White. It will form a white color on the paper sheet, unlike the subtraction one which will form a new color. First, choose two color cards and shine through it separately (don't put them together.)

Colour by subtraction

First, take two color cards and stick them together then get the flashlight and shine through it and take a look at the color. It forms a new color due to the two-color that's overlapping with each other.

By adding red and green together, the result is Cyan.

By adding blue and red together, the result is Magenta.

By adding blue and green, the result is Green.

## Wednesday, 13 September 2017

### Milk crystallization_Sai

Questions
1)  Why do we add salt to the ice?
ans. because we have to decrease the temperature to make the ice-cream, and salt can decrease the temperature of the ice.

2)  Why do we add the cookies and other things, only after the milk has frozen slightly
ans. It takes longer to make it frozen because there are many ingredient that absorb thermal energy.

3)  What are two factors that affect the freezing you think?
ans. Movement and low temperature

4)  Why do you need a bit of air in the bag?
ans. because it help the milk to move around and make contact with the ice.

How to make milk crystallisation

1) Pour the milk into the bug.

2) Put the bug into the container which is full of ice.

3) Put the salt in the ice.

4) Push the test tube rack up and down and hole the top of the bag until it becomes more solid.

5) Enjoy you ice - cream!!

## Thursday, 1 June 2017

### writing

mr. gary said it's okay