# Natural and Artificial Magnets

#### Students’ Learning Outcomes

·         Investigate using a magnet that some materials are “magnetic” and some are “nonmagnetic”
·         Recognize that a magnet has two poles.

#### Information for Teachers

·         Some materials are magnetic and some are non-magnetic.
·         Magnetic materials are those which are attracted by the magnet.
·         Non-magnetic materials are those which are not attracted by the magnet.
·         A magnet has two poles. One is called the North Pole and the other is called South Pole.
·         The magnet effect of a magnet is the strongest at the poles.

#### Material / Resources

Bar magnets, pencils, steel clips, pieces of wood, plastic objects, rulers, combs, erasers, steel nails, iron filing, textbook

#### Worm up activity

·         Ask the students how many of them have seen a magic piece of metal which attracts the iron pieces.
·         What do they call it?
·         Now show a bar magnet to the class.
·         Demonstrate that magnet attracts steel pins or clips.

## ·         Ask them what is common property in all the magnetic materials

#### Activity 2

·         Give a bar magnet and some iron filings to each group.
·         Ask them to place a magnet on a paper.
·         Sprinkle the iron filings on to the bar magnet and tap the table gently.
·         Observe the filing stuck to the bar magnet.
·         Ask the students, are the filings evenly stuck to all parts of the magnet?
·         Disturb the filings and repeat the process and see what happens.
·         Ask the students questions like:
v  On which parts of the magnet, are the iron filings mostly stuck?
v  Why are the iron filings stuck more at the ends?
(Expected answer: Magnet is stronger at the ends)
v  What do you call the ends of the magnet?
(Expected answer: Poles of the Magnet)
·         After this discussion, inform the students that the ends of magnet are called opposite poles and then introduce the terms of North Pole and South Pole.

#### Sum up / Conclusion

·         The materials which are attracted by the magnet are called as magnetic materials
·         The materials which are not attracted by a magnet are called non-magnetic materials.
·         Most of the iron filings are attracted towards the ends of the magnet. These ends are called poles.
·         There are two poles of a magnet. One is the North Pole and other is the South Pole.

#### Assessment

·         Make a table on the board and ask them to copy it in their notebooks.
·         Divide the students into groups.
·         Provide each group the materials given in the table.
·         Ask the students to predict, without using the magnet or not and then record their observations in the table. Instruct them put a tick in the right column.
·         Provide each group a magnet and instruct them to test the objects and record their observations in the given table.
 Sr. no. Materials Prediction Result Will be attracted by magnet Will not be attracted by magnet Attracted by magnet Not attracted by magnet Wooden Strip Iron nail Coin Plastic ruler Steel ruler Cotton Pencil Paper clips Brass wire Copper wire