BASIC SCIENCE AND TECHNOLOGY
THEME – YOU AND ENERGY
PREVIOUS LESSON – Basic Electricity II – Electric Flow, Conductors and Non Conductors, Sources and Electrical Circuit Primary 5 (Basic 5) Term 3 Week 4 Basic Science and Technology
2. Meaning of Magnetism
3. Magnet, Magnetic Materials and Non Magnetic Materials
4. Properties and Uses of Magnetism
5. Making Magnets
6. Lesson Evaluation and Weekly Assessment (Test)
By the end of the lesson, most of the pupils should have attained the following objectives –
1. explain the meaning of magnetism.
2. differentiate between magnetic and non magnetic materials.
3. group materials into magnetic and non-magnetic.
4. state the properties of magnets.
3. state common applications of magnetism.
4. make and use magnets.
The pupils can identify and differentiate between magnetic and non magnetic materials.
The teacher will teach the lesson with the aid of bar magnets, nails, pieces of paper, ropes, threads, light bulbs, connecting wires, circuit board, lamp holders, switch key, pins, bar magnets, nails, iron fillings, paper clips, coins, rubber bands, paper, cork, thread, wires, wool, wooden blocks, soft iron, loud speaker.
METHOD OF TEACHING
Choose a suitable and appropriate methods for the lessons.
Note – Irrespective of choosing methods of teaching, always introduce an activities that will arouse pupil’s interest or lead them to the lessons.
1. Scheme of Work
2. 9 – Years Basic Education Curriculum
3. Course Book
4. All Relevant Material
5. Online Information
CONTENT OF THE LESSON
LESSON 1 – INTRODUCTION
Magnetism is a force that can attract (pull closer) or repel (push away) objects that have a magnetic material like iron inside them (magnetic objects).
Magnets can be affected by electricity, which makes them very useful in machines and computers.
Magnets are used to make a tight seal on the doors to refrigerators and freezers, etc.
MEANING OF MAGNET
A magnet is a substance which can attract iron or steel material to itself.
Magnet are made of iron or steel.
TYPES OF MAGNETS
There are two types of magnets,
1. Permanent magnet
2. Temporary magnet
1. PERMANENT MAGNETS
Permanent magnets remain magnetized even without the influence of external magnetic field, such as a horseshoe magnet.
2. TEMPORARY MAGNETS
Temporary magnets may lose their magnetism when removed from the external magnetic field, such as an iron pin.
LESSON 2 – PROPERTIES OF MAGNETS
1. Magnets attract ferromagnetic materials, such as iron, nickel, and cobalt.
2. All magnets have two poles: North Pole and South Pole.
There are no magnets containing only one pole.
3. Like poles of two magnets repel each other; opposite poles of two magnets attract each other.
4. The magnetic force of a magnet is stronger at its poles than in the middle.
5. The stronger the magnets and the closer two magnets are to each other, the greater the magnetic force exerted on each other.
6. When a bar magnet is suspended by a thread freely in horizontal position, its north pole will move towards the North Pole of the earth and its south pole will move towards the South Pole of the earth.
This is because the earth is a giant magnet, and its geographical north pole is its magnetic south pole, and vice versa.
USES OF MAGNETS
Magnets have their lot of applications in the daily life.
The major 10 uses of the magnets are as follows:
1. They are also used to sort out the magnetic and non-magnetic substances from the scrap.
2. They are used in TV screens, computer screens, telephones and in tape recorders.
3. They are used by the candy or cold drink vendors to separate the metallic cap from the lots.
4. They are used in cranes.
5. They are also used in the speakers which can convert the electrical energy into sound energy.
6. They are used in the electrical bells.
7. They are used in the refrigerators to keep the door close.
8. The most important use of the magnet is the magnetic compass which is used to find the geographical directions.
9. They are used to construct the electrical motors and the generators which convert the electrical energy into mechanical energy and vice versa.
10. They are used in the Maglev trains.
In the Maglev trains, the super conducting magnets are used on the tracks on which the train floats. These types of the trains are working on the repulsion force of the magnets.
LESSON 2 – MAKING A TEMPORARY MAGNETS
1. Rub the magnet against the paperclip.
2. Move it in the same direction, rather than back and forth.
3. Use the same quick motion you’d use to light a match.
4. Continue rubbing the paperclip with the magnet 50 times as quickly as you can.
To deliver the lesson, the teacher adopts the following steps:
1. To introduce the lesson, the teacher revises the previous lesson. Based on this, he/she asks the pupils some questions;
2. Teacher organizes the pupils in groups or pair depending on the size of class.
3. Teacher gives each of the group or pair magnetic and non magnetic materials with magnet to examine, identify and describe.
Pupil’s Activities – Play with magnets to discover their properties, e.g. magnets will attract or repel one another, can act through non magnetic materials, etc.
4. Teacher asks pupils to classify the materials as magnetic and non magnetic materials.
Pupil’s Activities – Differentiate between magnetic and non magnetic materials with appropriate examples.
5. Teacher uses the group or pair to introduce the lesson.
Pupil’s Activities – Pay attention to the lesson introduction to understand the concept of the lesson.
6. Teacher leads a discussion on the meaning and types of magnetism.
Pupil’s Activities – Explain and state types of magnetism.
7. Teacher guides pupils to identify the properties of magnets.
Pupil’s Activities – State the properties of magnetism.
8. Teacher displays sample of magnets in some household appliances, e.g. doorbell, loudspeakers, magnetic stickers for fridge’s, magnetic screw drivers etc.
9. Teacher lets pupils examine and identify magnetic contents of each item.
Pupil’s Activities – Examine and identify the magnetic contents in all the items.
10. Teacher guides pupils state the uses of magnet using the identified items.
Pupil’s Activities – State the uses of magnet.
11. Teacher leads pupils on how to make temporary magnets.
Pupil’s Activities – Make a temporary magnet.
12. Teacher summarizes the lesson on the board with appropriate examples.
Pupil’s Activities – Participate actively in the summary of the lesson by responding correctly the teacher’s questions and writes as instructed.
- To conclude the lesson for the week, the teacher revises the entire lesson and links it to the following week’s lesson (revision).
Teacher asks pupils to:
1. explain the meaning of magnetism.
2. state 2 of properties of a magnet;
3. name 3 common appliances that use magnets
4. group materials into magnetic and non magnetic materials;
5. give 5 examples of magnetic objects and non magnetic objects.
6. state 5 uses of magnets.
7. make temporary magnets.