For Science, we started on a new topic, which is Interactions (Magnets). We watched 2 videos which talked about magnets.
1st video - http://www.youtube.com/watch?v=23whnt1oELM
This video talks about lodestones. Lodestones are natural rocks that have magnetic force which
a) can attract or repel magnets or
b) attract magnetic materials.
This video also showed the stroking of a nail on the lodestone. It made the nail into a temporary magnet with a weak magnetic force.
2nd video - http://www.youtube.com/watch?v=lRux43wwunU
Man-made magnets are a mixture of metals (may include non-magnetic metals like aluminium) that are melted and shaped into different shapes and sizes for different purposes. This video shows the making of a permanent magnet by passing an electromagnetic current in the hardened metal mixture.
Teacher, i found out about the magnets! The part which used to be north becomes south, and the part that used to be south became north. Fascinating!
ReplyDeletemr fadzeel,i went for tuition today n found out that when u stroke a part with the north part,it will be the north-seeking pole.that means Yuhao is right.i m not sure so pls tell me if i m wrong.tks;)
ReplyDeleteMichelle and Yu Hao, you're absolutely correct!!! When you stroke a nail with the north pole of the magnet, that part of the nail would be the north pole.
ReplyDeleteThis means that the part of the nail that first touches the magnet is the north pole of the nail (temporary magnet).
oh..so yuhao is right...
ReplyDeletevinnie;p
anyway,how come there is a Jeremino?
ReplyDeletegeronimo!!!
ReplyDelete