## Thursday, September 14, 2017

### crystallization of milk

crystallization of milk

1. Add milk in a bag
2. Put bag in a box
3. Put ice on top of the bag
5. Make it be semi-solid
6. Add topping in the bag
7. Repeat 2.- 4. again and finish.
Questions
1)  Why do we add salt to the ice?
Ans. Salt makes exotherm.
2)   Why do we add the cookies and other things, only after the milk has frozen slightly?
Ans. If you add before freezing, milk will soak topping.
3)  What are two factors that affect the freezing you think?
Ans. The temperature of milk and Temperature of Ice.
4)  Why do you need a bit of air in the bag?
Ans. Milk move easier.

## Wednesday, June 14, 2017

### Writing assessment

The industry made carbon dioxide in the air then if you have many carbon dioxide will make global warming.The global warming is a cause of acid rain. Acid rain will destroy the building and so many things in society.When you want to make energy from coal, it will create air pollution to place that nearby you.

## Wednesday, June 7, 2017

### Skill Practice

- Calculate the density of each of your mineral samples. How could you use the density to identify the minerals?
Ans. Density won't change so if you calculate again it will be same density.
- Key Concept Would density or color be more useful in identifying a particular mineral? Explain your answer.
Ans.  The density is easier than color to identify the minerals. Because color can be same but different types of minerals.

Density Lab

## Wednesday, February 22, 2017

### writing assessment

In this year, I did so many things in Kru Gary class. Kru Gary taught me about science in this year. He is my favourite science teacher. Next year, I will study harder for science to be a medical doctor in the future like my dad. This year Kru Gary's class always fun. I love this class. I want Kru Gary to teach me in next year. He made me like this subject. His fantastic word is "No pressure". He always says that in every class.

## Thursday, February 2, 2017

### cloud lab

This is cirrus cloud

This is Cumulus cloud

The last one is Stratus cloud

### Ball Bearing lab

The Effect of Gravity on Speed

Introduction
Gravity provides a constant acceleration (force) on an object. The effect is changed by using ramps at different angles. In this lab, you will find the optimal angle to maximize acceleration on a ball bearing so it travels the farthest and/or the fastest. Friction is the opposing force created by the surface interactions. Whenever something rolls due to a force, friction will oppose this force and slow it down.

Equipment needed:
Timer Ramp Ball Bearing
Graph Paper (2) Ruler

Procedure:
1. Put the ramp against the seat of a chair. Place the ramp and chair so that the ramp points towards the hallway. Have your teammate on the other end of the hallway.
2. Place the ball bearing at the top of the ramp.
3. Lift the ramp 20 cm and release the ball bearing
4. Time how long it takes to travel 5 meters.
5. See how far it will go..
6. Repeat the experiment three times for each height then do 40 cm, 60 cm, and 80 cm.

 Height Time to travel 5 meters Distance traveled 20 4.72 s 5.9 m 20 3.69 s 6 m 20 4.91 s 5.6 m 40 8.78 s 5.6 m 40 6.69 s 6.2 m 40 6.82 s 10 m 60 60 60 80 80 80

Observations:

The ball released from higher ramp travel faster and further. The ball release at height 80 cm went faster than and further than 20 cm.

1. Describe how the ball rolls off the ramp at each height—discuss the effect of bouncing or other               factors ?

Answer : The ball roll off at higher position went faster and longer distance than lower height. The result of the height of the ramp cause more acceleration of the ball

2. Discuss what is the fastest speed reached and any factors that could improve this ?

Answer : The ball with fastest speed was the one at highest angle. To improve speed, we need to change the angle higher.

3. Does the ball travel in a straight line, why or why not ?

Answer : Yes, because of the surface was smooth and does not cause friction between ball and ramp