第四、五课

Unit 2  magnet

第二单元 磁铁

 Small magnets, magnetic poles, repudiation of each other sucks there is a secret

小磁铁，有磁极，相斥相吸有秘密。

 Compass, it's amazing, it's easy to tell the direction.

指南针，真神奇，辨别方向很便利。

Lesson 4 Recognize the magnetic poles

 第四课 认识磁极

1 Activity preparation

活动准备

2 Paper clips, iron chips, nails. Fine line styrofoam

曲别针·铁屑·铁钉··细线·泡沫塑料

3 The activity process

活动过程

4 Try it, which part of the magnet sucks more iron.试一试，磁铁的哪个部位吸铁多。

5 The most magnet-absorbing part is the magnetic pole. Magnets have two poles磁铁吸铁最多的部位就是磁极。磁铁有两个磁极。

6 Explore skills

探究技能

7 According to the observed phenomenon of iron absorption by magnets, it is concluded that magnets of different shapes have two parts of iron absorption, at most, it is a conclusion.

根据观察到的磁铁吸铁现象，总结出不同形状的磁铁都有两个部位吸铁最多，就是在得出结论。

8 Let the magnet rotate freely and observe the direction in which both ends of the magnet will point when stationary.

让磁铁自由转动，静止后观察磁铁的两端会指向什么方向。

9 The two poles of a magnet are different; the pole pointing south is called the 'south pole' and is denoted by 'S'; the pole pointing north is called the 'north pole' and is denoted by 'N'.

磁铁的两个磁极是不同的；指向南方的磁极叫‘ 南极’，用‘S表示；指向北方的磁极叫’北极‘，用’N表示。

10 Expand your activities拓展活动

11 If a magnet breaks into two pieces, do each piece have two poles?

假如一块磁铁断成两块，每一块还有两个磁极吗？

Lesson 5 The secret of the magnetic pole

第五课 磁极的秘密

1 Activity preparation

活动准备

2 Small cartons and iron blocks

小纸盒·铁块

3 The activity process活动过程

4 What did you find when you had the poles of the two magnets test each other?

让两块磁铁的磁极相互考级，有什么发现？

5 Play small games with magnets玩磁铁小游戏。

6 What happens when you let the magnet slowly approach the small needle?

让磁铁慢慢靠近小磁针，会怎么样？

7 I can get the car forward or backward.

我能让小车前进或后退。

8 Two small boxes contain iron and magnets两个小盒中分别装着铁和磁铁。

9 Expand your activities

拓展活动

10 Play around with different shapes of magnets and find out their N、S poles.

玩一玩不同形状的磁铁，找出它们的N、S极。