Comparing the weight of familiar objects for Primary 1

Class: Primary One
Term: Third Term
Week: 6
Age: 6 years
Duration: 45 minutes
Subject: Basic Science
Curriculum Theme: Science, Technology and Development
Focal competence: Using technology products to measure weight, length and time
Key competencies/values: Research and Problem Solving; Communication
Skills:

• Comparing mass/weight of objects and things using the words heavy and light

Previous Lesson: Comparing the length of objects
Topic: Measuring Things: Weight
Subject Matter: Comparing the weight of familiar objects

Specific Objectives

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

Cognitive Domain

• Compare the weight of familiar objects.
• Identify objects as heavy or light.

Affective Domain

• Show interest in comparing object weights.
• Appreciate the use of a simple balance scale.

Psychomotor Domain

• Use the words heavy and light correctly to describe objects.
• Group familiar objects according to their weight.

Social Domain

• Work cooperatively with peers during comparison activities.

Reference Materials

The following resources were used in planning this lesson:

• 2025 Revised 9 Years Basic Education Curriculum
• Relevant State Unified Scheme of Work
• Basic Science for Primary Schools 1
• The HeadTeacher Scheme of work

Instructional Materials

The teacher will teach this lesson with the aid of:

• A simple balance or weighing scale
• A stone
• A feather
• A textbook
• An exercise book
• A small bottle of water
• An empty plastic bottle
• A pencil
• An eraser

Rationale for the Lesson

This lesson helps pupils develop foundational scientific observation skills by introducing the concept of weight. Understanding weight enables pupils to describe and classify objects in their environment more accurately. This knowledge is essential for daily life and forms a basis for more complex scientific concepts in later years.

Prerequisite/Previous Knowledge

Pupils can identify various familiar objects in their classroom and home environments.

Lesson Content/Board Summary

Measuring Things: Weight

What is Weight?

Weight tells us how heavy or light an object is. Some things are heavy, and some things are light.

Comparing Heavy and Light Objects

We can compare objects to see which one is heavier and which one is lighter.

1. Heavy Objects: These are objects that are difficult to lift or feel like they pull down a lot.
2. Light Objects: These are objects that are easy to lift or feel like they do not pull down much.

Weighing Instruments

A simple balance or weighing scale can help us compare the weight of objects more easily.

1. When a heavy object is placed on one side of a balance, that side goes down.
2. When a light object is placed on the other side, that side stays up or goes up.

How to Compare Weights

To compare the weight of two objects:

1. Hold one object in each hand.
2. Feel which hand feels like it is being pulled down more. That object is heavier.
3. You can also use a simple balance scale to see which side goes down.

Recording Weight Comparisons

After comparing objects, we can say:

1. “The stone is heavier than the feather.”
2. “The feather is lighter than the stone.”
3. “The textbook is heavier than the exercise book.”

Teaching Methods/Instructional Techniques

Discussion, Demonstration, Guided Practice, Question and Answer, Explanation, Observation, Practical Activity

Instructional Procedures

Step 1: Introduction

Time: 5 minutes

Teaching Skill: Activating prior knowledge

Teacher’s Activity: The teacher greets the pupils and asks them to name some objects they see in the classroom. The teacher then picks up a stone and a feather, asking pupils which one they think is easier to lift.

Pupils’ Activity: Pupils name objects and give their opinions on lifting the stone and feather.

Learning Point: Introduction to weight comparison

Step 2: Explanation of Weight

Time: 7 minutes

Teaching Skill: Explaining/Defining

Teacher’s Activity: The teacher explains in simple terms that weight tells us how heavy or light something is. The teacher demonstrates by lifting a heavy object (e.g., a textbook) and a light object (e.g., a pencil), describing them as “heavy” and “light” respectively.

Pupils’ Activity: Pupils listen attentively and observe the teacher’s demonstration.

Learning Point: Meaning of weight

Step 3: Demonstration of Heavy and Light

Time: 8 minutes

Teaching Skill: Demonstration

Teacher’s Activity: The teacher demonstrates comparing heavy and light objects using pairs like:

1. Stone and feather
2. Textbook and exercise book
3. Small bottle of water and empty plastic bottle

The teacher holds one object in each hand and describes which is heavy and which is light, using the words correctly.

Pupils’ Activity: Pupils observe the teacher’s demonstration and listen to the descriptions.

Learning Point: Identifying heavy and light

Step 4: Pupils Compare Objects

Time: 8 minutes

Teaching Skill: Guided Practice

Teacher’s Activity: The teacher distributes various safe classroom objects (e.g., pencils, erasers, small stones, leaves) to pairs or small groups of pupils. The teacher instructs them to pick up two objects, one in each hand, and compare their weights, describing them as “heavy” or “light.”

Pupils’ Activity: Pupils compare selected objects and describe them as heavy or light to their partners.

Learning Point: Practical weight comparison

Step 5: Introducing Weighing Instrument

Time: 5 minutes

Teaching Skill: Introducing concepts

Teacher’s Activity: The teacher introduces a simple balance scale or weighing scale. The teacher demonstrates how to use it by placing a heavy object on one side and a light object on the other, showing how the heavier side goes down. The teacher explains that this helps us compare weights accurately.

Pupils’ Activity: Pupils observe how the balance scale works and understand its use.

Learning Point: Use of balance scale

Step 6: Grouping Objects by Weight

Time: 3 minutes

Teaching Skill: Classification

Teacher’s Activity: The teacher asks pupils to help group some objects into “heavy” and “light” categories based on their observations and comparisons. The teacher guides them to place objects in designated areas on the table.

Pupils’ Activity: Pupils help group familiar objects according to their weight.

Learning Point: Grouping objects by weight

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

1. Pick up the stone and the feather. Which one is heavy?
2. Which word do we use for objects that are easy to lift?
3. Name one heavy object and one light object you see in the classroom.
4. How can we compare the weight of two objects?

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Understanding heavy and light

Step 8: Note-Taking

Time: 4 minutes

Teaching Skill: Guided Writing

Teacher’s Activity: The teacher guides pupils to copy the essential Board Summary notes on comparing weight into their notebooks.

Pupils’ Activity: Pupils copy the notes carefully into their notebooks.

Learning Point: Recording weight concepts

Step 9: Conclusion

Time: 2 minutes

Teaching Skill: Reinforcement

Teacher’s Activity: The teacher briefly reminds pupils that they have learned to compare objects using the words “heavy” and “light” and that a balance scale can help them do this. The teacher encourages them to practice comparing objects at home.

Pupils’ Activity: Pupils listen and acknowledge the conclusion of the lesson.

Learning Point: Weight comparison reinforced

Continuous Assessment/Further Study

Type: Homework

Instruction: Observe objects around your house and complete the following:

1. Name two objects that are heavy.
2. Name two objects that are light.
3. Find two objects at home and tell your parents which one is heavier and which one is lighter.

Lesson Keywords

• Weight – How heavy or light something is.
• Heavy – Difficult to lift, pulls down a lot.
• Light – Easy to lift, does not pull down much.
• Compare – To look at two or more things to see how they are similar or different.
• Balance scale – An instrument used to compare the weight of two objects.

Differentiation

For weaker learners: Provide more direct hands-on practice with very distinct heavy and light objects. Use simple one-word answers for comparisons.
For faster learners: Encourage them to find more objects to compare and to explain why one object is heavier or lighter than another. They can also draw heavy and light objects in their notebooks.

Suggested Lesson Videos

For a visual explanation of comparing weights, search on YouTube for:
“Primary 1 comparing heavy and light objects”
“Basic Science weight comparison for kids”

Teacher Guide for Using This Lesson Plan

Before the lesson, gather a good selection of familiar, safe objects with noticeable weight differences, along with a simple balance scale. Begin by engaging pupils with real-world examples to make the concept of weight tangible. Guide them through the hands-on activity of comparing objects by lifting them, ensuring they use the terms “heavy” and “light” correctly. Demonstrate the use of the balance scale clearly. During the grouping activity, observe pupils closely to identify any misconceptions. Allow sufficient time for pupils to copy the Board Summary notes after the evaluation. Encourage pupils to explore weight comparisons in their daily lives to reinforce learning.