Basic Science and Technology - Junior Secondary 3 - Magnetism I

Magnetism I

Get it on Google Play
Get it on the Apple App Store
  1. Home
  2. Comprehensive Lesson Plan and Notes
  3. Junior Secondary 3
  4. Magnetism I

TERM: 2ND TERM

WEEK: 7

CLASS: Junior Secondary School 3

AGE: 14 years

DURATION: 40 minutes each for 2 periods

DATE:

SUBJECT: Basic Science

TOPIC: Magnetism I

SPECIFIC OBJECTIVES: At the end of the lesson, the learners should be able to

  1. ) Define magnetism
  2. ) Describe what lodestone is
  3. ) Discuss the concept of magnetic pole and magnetic fields

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, story-telling, videos from source

INSTRUCTIONAL MATERIALS: Recommended Basic Science textbooks for Junior Secondary School 3

INSTRUCTIONAL PROCEDURES: PERIOD 1-2:

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1

Review

The teacher revises the previous lesson.

Learners pay attention

STEP 2

Introduction

He defines magnetism and describes what lodestone is

Learners pay attention and participate

STEP 3

Explanation

He discusses the concept of magnetic pole and magnetic fields

Learners pay attention and participate

STEP 4

NOTE TAKING

The teacher writes a short note on the board for the learners to copy

The learners copy the note from the board

 

NOTE

MAGNETISM

Magnetism is a physical phenomenon associated with the motion of electric charges, which results in attractive and repulsive forces between objects. It is one of the fundamental forces of nature and is most commonly observed in materials like iron, nickel, and cobalt, which can become magnets. Magnetism arises due to the movement of electrons within atoms and the alignment of magnetic domains in materials.

 

What Lodestone Is:
Lodestone is a naturally magnetized piece of the mineral magnetite, which is made up of iron oxide. It has magnetic properties and can attract small metal objects like iron filings. Lodestone is often considered the first natural magnet discovered by ancient civilizations. It is thought to have been used in early navigation, as it can align itself with the Earth's magnetic field, functioning like a primitive compass.

 

Magnetic Poles and Magnetic Fields:

  • Magnetic Poles: Every magnet has two poles: a north pole and a south pole. These poles are regions where the magnetic force is strongest. Opposite poles (north and south) attract each other, while like poles (north and north, or south and south) repel each other.
  • Magnetic Fields: A magnetic field is the region around a magnet where magnetic forces are exerted. It is represented by field lines that emerge from the north pole and curve around to enter the south pole. The strength and direction of the magnetic field can be detected using a compass or iron filings. The Earth's magnetic field also behaves like a giant magnet, with its north and south poles influencing navigation and compasses

 

EVALUATION:

  1. How does magnetism arise at the atomic level, and how do the movements of electrons contribute to the magnetic properties of materials?
  2. What are the unique properties of lodestone, and how did its discovery contribute to the development of early navigation techniques?
  3. Explain the relationship between magnetic poles and how they interact with each other. Why do like poles repel and opposite poles attract?
  4. What is the significance of the magnetic field surrounding a magnet, and how can it be visualized or measured?
  5. How does Earth's magnetic field function, and what role does it play in navigation and the use of compasses?

CLASSWORK: As in evaluation

CONCLUSION: The teacher marks their books and commends them positively