6.5 and 6.3

  

6.5 starter

Demo

·         How I turned a needle into a compass to find my way out of the jungle...

·         6.5 understand that magnetism is induced in some materials when they are placed in a magnetic field

·         6.3 recall the properties of magnetically hard and soft materials

Practical

1.      Stroke a magnet along a steel bar and an iron bar

2.      Try picking up some bar clips

3.      Bang both bars on the desk

4.      Now try picking up the paperclips again

5.      Repeat the experiment but this time put the bars inside an electromagnet instead of stroking them

Explanation

·         Steel is a magnetically hardmaterial.  It retains its magnetism when magnetised

·         Iron is a magnetically softmaterial.  It can be magnetised, but easily loses its magnetism