Lesson Notes By Weeks and Term v3 - Primary 5
Magnetism
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Magnetism
Download the Lessonotes Mobile Nigeria 2025 app for faster lesson access on Android and iPhone.
Subject: Basic Technology
Class: Primary 5
Term: 3rd Term
Week: 3
Theme: You And Energy
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state the properties of magnets group materials in to magnetic and non-magnetic state the common application of magnetism make use of magnets
A. What is a Magnet? A magnet is an object or a material that produces a magnetic field. This magnetic field is invisible but is responsible for the force that pulls on ferromagnetic materials (like iron, steel, nickel, and cobalt) and attracts or repels other magnets. Magnets can be natural (e.g., lodestone) or artificial (manufactured).
B. Properties of Magnets: Attractive Property: Magnets attract certain materials. These materials are called magnetic materials. Examples include iron nails, steel spoons, paper clips, and tin cans (which are often steel-based).
Repulsive Property: When two magnets are brought close to each other, they can either attract or repel. This happens because every magnet has two poles: a North (N) pole and a South (S) pole.
Like poles repel: North pole repels North pole, and South pole repels South pole.
Unlike poles attract: North pole attracts South pole.
Poles Exist in Pairs: Every magnet, no matter how small it is broken, will always have both a North pole and a South pole. The magnetic force is strongest at these poles. Directional Property (Law of Magnetic Poles): If a magnet is suspended freely (e.g., by a string), it will always come to rest pointing in a specific direction: its North pole will point approximately towards the Earth's geographic North, and its South pole towards the Earth's geographic South. This property is used in compasses.
Induction (Making Temporary Magnets): A magnet can induce magnetism in a magnetic material placed near it or in contact with it. This means a magnetic material can temporarily become a magnet itself when influenced by a permanent magnet. This principle is used to create temporary magnets.
C. Magnetic and Non-Magnetic Materials: Magnetic Materials: These are materials that are attracted by a magnet. They typically contain iron, steel, nickel, or cobalt.
Examples relevant to Nigeria:* Iron nails, steel spoons, iron rods used in building construction, tin cans (often steel), old vehicle parts made of iron.
Non-Magnetic Materials: These are materials that are not attracted by a magnet.
Examples relevant to Nigeria:* Wood, plastic buckets, rubber slippers, glass bottles, copper wires, aluminium pots, sand, paper, stones.
D. Common Applications of Magnetism: Magnets are used in a wide array of devices and situations: Refrigerator Door Seals: Flexible magnetic strips are embedded in the door seals to keep the fridge door tightly closed, preventing cold air from escaping.
Loudspeakers and Headphones: Magnets work with electric coils to produce sound vibrations.
Electric Motors and Generators: Magnets are fundamental to the operation of these devices, converting electrical energy to mechanical energy (motors) or vice-versa (generators). Many small motors are found in toys, fans, and pumps.
Compasses: A small magnet, free to rotate, aligns itself with the Earth's magnetic field to indicate direction (North, South, East, West). This is useful for navigation.
Magnetic Clasps and Latches: Used in bags, jewellery, and cupboard doors.
Scrap Metal Sorting: Large electromagnets are used in recycling plants (e.g., in Lagos or Port Harcourt) to lift and separate ferrous metals (magnetic) from other non-ferrous waste materials.
Magnetic Toys: Many children's toys incorporate magnets for playful interaction.
E. Making Temporary Magnets (Stroking Method): One simple way to make a temporary magnet is by the stroking method: Take a magnetic material, such as an iron nail or a steel paper clip. Take a permanent magnet (e.g., a bar magnet). Stroke the iron nail with one pole of the permanent magnet (e.g., the North pole) repeatedly. Crucially, stroke in only one direction, lifting the permanent magnet completely off the nail after each stroke before returning to the starting point. Repeat this process 20-30 times. Test the iron nail by bringing it close to a small paper clip or iron filings. The nail should now temporarily attract these items, indicating it has become a temporary magnet.
A. Introduction (10 minutes)
Teacher Activity: Display various items: a bar magnet, iron nails, a steel spoon, a wooden block, a plastic ruler, a coin, a rubber eraser, a paper clip, and a piece of cloth.
Student Activity: Learners are asked to predict which items they think the magnet will attract. The teacher then demonstrates by bringing the magnet close to each item, observing student reactions and sparking curiosity.
Teacher Activity: Introduce the term "magnetism" and state the topic for the day.
B. Exploring Properties of Magnets (15 minutes)
Teacher Activity: Explain the concept of magnetic poles (North and South) and demonstrate attraction and repulsion using two bar magnets. Show how like poles repel and unlike poles attract.
Student Activity: In small groups, learners are given two magnets each. They experiment by bringing different ends of the magnets together, feeling the push (repulsion) and pull (attraction).
Teacher Activity: Demonstrate the directional property by suspending a bar magnet from a string, allowing it to swing freely until it points North-South. Explain its use in compasses.
Student Activity: Learners observe the suspended magnet and discuss its practical implications.
C. Grouping Magnetic and Non-Magnetic Materials (15 minutes)
Teacher Activity: Provide a collection of various materials found in a typical Nigerian classroom or home (e.g., iron nail, steel paper clip, aluminium foil, copper wire, wood, plastic bottle, stone, glass, piece of fabric, small coin, rubber band).
Student Activity: In groups, learners use a magnet to test each material. They then sort the materials into two categories: "Magnetic Materials" and "Non-Magnetic Materials." Each group records their findings.
Teacher Activity: Facilitate a class discussion, asking groups to share their classifications and observations. Correct any misconceptions.
D. Applications of Magnetism (10 minutes)
Teacher Activity: Present pictures or actual items (if available) that use magnets (e.g., old speaker, fridge magnet, compass, magnetic toys). Discuss how magnets are used in each.
Student Activity: Learners identify and discuss other common appliances or situations where they have observed magnets being used in their homes or communities (e.g., door seals, handbag clasps, toys). The teacher relates these to Nigerian contexts.
E. Making Temporary Magnets (15 minutes)
Teacher Activity: Demonstrate the stroking method to make a temporary magnet using a permanent magnet and an iron nail (or paper clip). Emphasize stroking in one direction only.
Student Activity: In pairs or small groups, learners attempt to make their own temporary magnets using the provided materials (iron nails/paper clips and permanent magnets). They then test their temporary magnets by trying to pick up small paper clips or iron filings.
Teacher Activity: Supervise and provide assistance, ensuring safety and correct procedure. Discuss the temporary nature of these magnets.
F. Conclusion and Review (5 minutes)
Teacher Activity: Briefly recap the key properties of magnets, the difference between magnetic and non-magnetic materials, common applications, and the method of making temporary magnets.
Student Activity: Ask quick review questions to check understanding (e.g., "Name two things a magnet will attract," "What happens when you bring the North pole of one magnet near the North pole of another?").
Question 1: A teacher brings the following items to class: an iron nail, a plastic comb, a steel spoon, a wooden pencil, and a copper coin. If a magnet is used, which of these items will be attracted to it?
Solution: The items that will be attracted to the magnet are the iron nail and the steel spoon.
Commentary: This question assesses the learner's ability to identify magnetic materials. Iron and steel are common magnetic materials found in Nigerian households and workshops.
Question 2: Explain what happens when you bring the North pole of one magnet close to the South pole of another magnet.
Solution: When the North pole of one magnet is brought close to the South pole of another magnet, they will attract each other.
Commentary: This tests the understanding of the attractive property of unlike poles, a core property of magnets.
Question 3: Name two common items you can find in a typical Nigerian home or school that use magnets.
Solution: Refrigerator door: The door seal contains magnets to keep it shut.
Loudspeaker/Radio: Used in the speakers to produce sound.
Magnetic toys: Many children's toys use magnets. (Any two of the above, or other appropriate examples like a magnetic catch on a cupboard door).*
Commentary: This question connects the concept of magnetism to practical, everyday applications learners are familiar with in their local context.
Question 4: Describe, in simple steps, how you can make an iron nail temporarily magnetic using a permanent magnet.
Solution: Take an iron nail and a permanent magnet. Rub (stroke) the iron nail with one pole of the permanent magnet. Make sure to stroke in only one direction (e.g., from the head to the tip of the nail). Lift the permanent magnet completely off the nail after each stroke before returning to the starting point to repeat the stroke. Repeat this process about 20-30 times. The nail should then be able to attract small magnetic items like paper clips.
Commentary: This evaluates the learner's understanding and ability to recall the practical steps for creating a temporary magnet, a key hands-on skill.
A. Differentiation (Supporting Diverse Learners): For Learners with Learning Difficulties: Provide more visual aids and larger, easily manipulable magnets and objects for testing. Break down instructions into smaller, simpler steps. Use matching activities (e.g., matching pictures of objects to "magnetic" or "non-magnetic" labels). Pair them with a peer helper for practical activities. Focus on mastering the attractive property and identifying magnetic vs. non-magnetic materials, rather than complex explanations.
For English Language Learners: Use clear, simple English and provide Nigerian vernacular translations for key terms where appropriate. Utilize diagrams, realia, and gestures extensively. Encourage discussion in their first language within groups, then reporting back in English. Provide vocabulary lists with definitions and images.
B. Remediation (Addressing Learning Gaps): Targeted Re-demonstration: For learners struggling with concepts like poles or induction, re-demonstrate the specific activity one-on-one or in a small group.
Simplified Experiments: Provide a set of clearly labeled materials for learners to re-test with a magnet, focusing on hands-on repetition to solidify the concept of magnetic vs. non-magnetic. "What If" Scenarios: Use simple "what if" questions to help learners think through the properties (e.g., "What if I use a plastic spoon instead of a steel spoon?").
Flashcards: Create flashcards with properties or applications for quick recall and review.
C. Extension (Challenging High-Achieving Learners): Research Project: Encourage learners to research other uses of magnets (e.g., maglev trains – briefly, or magnetic storage devices, MRI scanners) and present their findings to the class.
Design a Magnetic Game/Toy: Challenge learners to design a simple game or toy that uses magnetic principles, perhaps drawing sketches and explaining its mechanism.
Explore Electromagnets: Introduce the concept of an electromagnet (a temporary magnet created by electric current) as a follow-up, demonstrating a simple circuit with a battery, wire, and iron nail to create a temporary magnet, if resources and time permit. This links magnetism to electricity.
Waste Management and Recycling: In Nigerian cities, separating metallic waste (e.g., tin cans, iron scraps from workshops) from other refuse is crucial for recycling. Magnets can be effectively used in sorting processes to quickly separate magnetic metals, contributing to a cleaner environment and economic value from waste. Learners can relate this to informal waste collectors and recycling hubs in their communities.
Local Innovations and Repairs: Basic understanding of magnetism can help learners appreciate how local technicians or electricians repair items like radios, speakers, or small toy motors. It introduces the idea of how simple physical principles are applied in practical problem-solving and repair work common in Nigerian neighbourhoods.
Navigation and Adventure: The directional property of magnets is vital in compasses. This can be integrated by discussing how people in rural areas, travellers, or even fishermen use compasses for direction, especially in areas without clear landmarks or network connectivity. It can also link to simple outdoor activities like scouting.