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Archive for the ‘Science Primary 3’ Category

Another nice video for revision, for SJKC Primary 3 Science Chapter 4.

You can find quite a number of good video teaching SJKC subjects here https://www.youtube.com/channel/UCCXkI6j2biwOa327qx1D_kg/playlists.

APlusCenter

I particularly like the Science videos, e.g. this one teaching about Magnets. Good for revision.

plant

Ling was doing the below exercise and she got confused whether bamboo has woody stem or soft stem. (竹子是属于草质茎还是木质茎?) Actually I am very confused too.

2015-01-29 10.49.14

 

After googling and the below explanation makes the most sense for me :

草木之别的关键要看是否有“年轮”。木本植物每过一年,茎干的横断面便增添一圈同心轮纹,然而锯断竹子看,里面却空空如也。由此可知,竹子是“草”。而非“树”。竹子属禾本科多年生常绿植物,与稻、稗等同属一科

The difference between ‘woody stem’ and ‘soft stem’ is  the existence of ‘tree ring’.  By looking at the cross-section of a ‘woody stem’ plant, you can see the annual rings formed due to the growth of the stem(trunk). When you saw a bamboo stem, it’s empty inside. Therefore, bamboo is ‘grass’ and not ‘tree’. Bamboo belongs to the same group as paddy and millet.

Note: if you want to learn more about tree rings and woody stem, check out this website: http://www.realtrees4kids.org/sixeight/stemsrings.htm

This video gives an intro about simple machines such as: Pulley, Slide (inclined plane), Wheel, Lever, Screw.

It also goes further on the different types of Lever, by explaining the different parts of a lever system, which is: Effort, Fulcrum and Load.

lever

 

This video starts with a brief history of Lodestone and its discovery in Magnesia (an ancient Greek city, also is believed how Magnet got the name).

Note: Lodestone is a naturally magnetized piece of mineral found on earth.

lodestone

Then the video talks about the 4 features of magnet:

  • attraction: materials that get attracted to magnet
    • iron 铁
    • steel 钢
    • nickel 镍 nickel
    • cobalt 钴cobalt
  • navigation: use of magnet in compass
  • magnet always has two poles
  • same poles attract, opposite repel

Ling requested for video about ‘soil’ for her revision, and here it is:

It teaches the 3 types of soil:

  • clay 黏土
  • sand 沙土
  • loam 壤土

and the soil profile.

The animation makes it easier for children to understand this topic.


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