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Archive for the ‘Science Primary 4’ Category

My girls said they always mix up the sequence. Keeping this exercise here for future revision.

Std4

This video explains about heat and electric insulators and conductors.

I like the explanation of electric conductor: the electrons are very loosely bound to the nucleus. They can move freely.

conductor

 

Revisit this video to learn about Solar and Lunar Eclipses.

This video gives an intro to our solar system, starting with the Sun 🙂

solarsystem

Now, need to mention about the change of status for Pluto, in year 2006, Pluto was relegated to “dwarf-planet” (which means downgraded from “planet”) status by the International Astronomical Union (IAU). They booted it out because there appeared to be a bunch of other big rocks just like Pluto out beyond the eighth planet (Neptune), all considered too puny to be called a planet.

The IAU definition of a planet is:

planetdef

Since Pluto could not fill the third requirement, it was demoted to a status of “dwarf planet”.

This video gives an intro to primary school children on our respiratory system.

First it introduces “Oxygen”氧气 – ‘fresh air’ breathed in to our body, and “Carbon Dioxide” 二氧化碳 – ‘dirty air’ which we breathe out.

Then, it goes through each part of our respiratory system and explaining how it functions.

res1

I like the animation showing how Alveoli performs the exchange of Carbon Dioxide and Oxygen in blood.

res2

And in the video, it shows an experiment on how lungs and diaphragm work using rubber and balloon. I believe this is also done in the classroom, and the below are teacher’s favourite exam questions.

 

E.g.: Choose the correct answer.

1. When we breathe in:

res3

Diaphragm 横隔膜 (goes down 往下移,goes up往上移),  and Lungs 胸腔 (expand 扩张,contract 收缩).

2. When we breathe out:

res4

Diaphragm 横隔膜 (goes down 往下移,goes up 往上移),  and Lungs 胸腔 (expand 扩张,contract 收缩).

 

 

 

Answer:

1. moves down, expand

2. moves up, contract

This video teaches about temperature and the rule where ‘things contract in cold, and expand in heat‘.


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