Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: 3rd Term
Week: 5
Age: 15 years
Duration: 45 minutes
Subject: Basic Electronics
Curriculum Theme: Basic Electronics
Previous Lesson: Magnets and Magnetism: Applications of Magnetism.
Topic: MAGNETS AND MAGNETISM Demonstration of law of attraction and repulsion.
Subject Matter: practical steps for demonstrating attraction, practical steps for demonstrating repulsion, observing magnetic effects with iron filings, safety and care when handling magnets

Specific Objectives

By the end of the lesson, pupils should be able to:

Cognitive Domain:

Define magnetism.
State the law of magnetic attraction and repulsion.
Describe the practical steps for demonstrating magnetic attraction.
Describe the practical steps for demonstrating magnetic repulsion.
Explain how to observe magnetic effects using iron filings.

Affective Domain:

Appreciate the importance of magnetism in everyday life and technology.
Adhere to safety rules when handling magnets and other materials during experiments.

Psychomotor Domain:

Demonstrate the law of magnetic attraction using bar magnets.
Demonstrate the law of magnetic repulsion using bar magnets.
Observe and sketch magnetic field patterns using iron filings.

Collaborate effectively with peers during practical demonstrations.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Electronics (Senior Secondary School)
State Unified Scheme of Work for Basic Electronics
Basic Electronics for Senior Secondary Schools by [Author’s Name/Publisher’s Name]

Instructional Materials

The teacher will teach this lesson with the aid of:

Bar magnets
Iron filings
Sheet of paper

Rationale for the Lesson

Understanding magnets and magnetism is important because it explains how many electronic devices and everyday tools work. This lesson helps pupils grasp fundamental principles of force and interaction, which are key to further studies in electronics and physics.

Prerequisite/Previous Knowledge

Pupils are expected to have a basic understanding of forces and simple materials from their Junior Secondary School science lessons.

Lesson Content/Board Summary

Magnets and Magnetism: Law of Attraction and Repulsion

What is Magnetism?

Magnetism is a fundamental force of nature that attracts or repels magnetic materials. It is produced by magnets, which have two poles: North and South.

Law of Magnetic Attraction and Repulsion

This law describes how magnets interact:

Like poles (e.g., North-North or South-South) repel each other.
Unlike poles (e.g., North-South) attract each other.

Practical Steps for Demonstrating Magnetic Attraction

To demonstrate magnetic attraction:

Obtain two bar magnets.
Bring the North pole of one magnet close to the South pole of the other magnet.
Observe that the magnets pull towards each other, showing attraction.

Practical Steps for Demonstrating Magnetic Repulsion

To demonstrate magnetic repulsion:

Obtain two bar magnets.
Bring the North pole of one magnet close to the North pole of another magnet (or South pole to South pole).
Observe that the magnets push away from each other, showing repulsion.

Observing Magnetic Effects with Iron Filings

To observe magnetic field patterns:

Place a bar magnet on a flat surface.
Place a sheet of paper over the magnet.
Gently sprinkle iron filings onto the paper.
Lightly tap the paper to allow the iron filings to align themselves along the magnetic field lines.
Observe the pattern formed, which represents the magnetic field around the magnet.

Safety and Care When Handling Magnets

The following safety and care measures should be observed:

Avoid dropping magnets, as they can lose their magnetism or break.
Keep magnets away from electronic devices, credit cards, and data storage devices to prevent damage.
Store magnets properly, often with keepers, to maintain their strength.
Handle iron filings carefully to avoid inhalation or contact with eyes.

Teaching Methods/Instructional Techniques

Discussion, Lecture, Demonstration, Question and Answer, Visual Aids

Instructional Procedures

Step 1: Introduction

Time: 5 minutes
Teaching Skill: Set Induction
Teacher’s Activity: The teacher greets the pupils and asks them to mention common items that use magnets (e.g., refrigerator doors, speakers). The teacher then introduces the topic: “Magnets and Magnetism: Law of Attraction and Repulsion.”
Pupils’ Activity: Pupils respond to the teacher’s questions and listen attentively.
Learning Point: Pupils recall prior knowledge of magnets and are prepared for the new lesson.

Step 2: Presentation of Magnetism and its Law

Time: 5 minutes
Teaching Skill: Explanation/Definition
Teacher’s Activity: The teacher defines magnetism and explains the law of magnetic attraction and repulsion, writing key points on the board.
Pupils’ Activity: Pupils listen, take notes, and ask questions for clarification.
Learning Point: Pupils understand the definition of magnetism and the fundamental law governing magnetic interactions.

Step 3: Practical Demonstration of Magnetic Attraction

Time: 10 minutes
Teaching Skill: Demonstration/Observation
Teacher’s Activity: The teacher gathers the instructional materials (bar magnets) and demonstrates the law of attraction by bringing unlike poles of two magnets together. The teacher guides pupils to observe the pulling force.
Pupils’ Activity: Pupils observe the demonstration carefully and describe what they see.
Learning Point: Pupils visually confirm and understand magnetic attraction.

Step 4: Practical Demonstration of Magnetic Repulsion

Time: 10 minutes
Teaching Skill: Demonstration/Observation
Teacher’s Activity: Using the same bar magnets, the teacher demonstrates the law of repulsion by bringing like poles together. The teacher guides pupils to observe the pushing force.
Pupils’ Activity: Pupils observe the demonstration and describe the repulsive effect.
Learning Point: Pupils visually confirm and understand magnetic repulsion.

Step 5: Observing Magnetic Effects with Iron Filings

Time: 5 minutes
Teaching Skill: Demonstration/Visualisation
Teacher’s Activity: The teacher demonstrates how to observe magnetic field patterns using a bar magnet, a sheet of paper, and iron filings. The teacher explains that the patterns show the invisible magnetic field.
Pupils’ Activity: Pupils observe the formation of magnetic field lines and understand how they represent the magnetic field.
Learning Point: Pupils learn a method to visualize magnetic fields.

Step 6: Discussing Safety and Care When Handling Magnets

Time: 3 minutes
Teaching Skill: Instruction/Precaution
Teacher’s Activity: The teacher discusses important safety precautions and care tips for handling magnets and iron filings during experiments and in general use. The teacher emphasizes keeping magnets away from electronics.
Pupils’ Activity: Pupils listen, ask questions, and note down the safety guidelines.
Learning Point: Pupils learn proper and safe handling procedures for magnets and related materials.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

Teacher’s Activity: The teacher evaluates the learning by asking the following questions:

Define magnetism.
State the law of magnetic attraction and repulsion.
Describe two practical steps to demonstrate magnetic attraction.
Mention one safety precaution to observe when handling magnets.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 2 minutes
Teaching Skill: Summarization/Consolidation
Teacher’s Activity: The teacher briefly summarizes the key points of the lesson, reiterating the law of attraction and repulsion and the importance of safety. The teacher assigns homework, asking pupils to draw the magnetic field pattern observed with iron filings.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils consolidate their understanding of the lesson and are given a task to reinforce learning.

Lesson Keywords

Magnetism – A force that attracts or repels magnetic materials.
Magnet – An object that produces a magnetic field and attracts ferromagnetic materials.
Poles – The ends of a magnet where the magnetic force is strongest (North and South).
Attraction – The force that pulls unlike poles of magnets together.
Repulsion – The force that pushes like poles of magnets apart.
Iron filings – Small pieces of iron used to visualize magnetic field lines.

Differentiation

For pupils who grasp concepts quickly, they can be tasked with researching practical applications of magnetism. For those needing more support, the teacher can provide additional guidance during the practical demonstrations and simplify explanations.

Note for teachers using this lesson plan

Ensure all demonstration materials are readily available and in good working condition before the lesson. Encourage active participation and allow pupils to handle magnets under supervision if time permits. Emphasize the real-world relevance of magnetism.