**Lesson Plan: Measurement of Mass**
**Grade Level:** Primary 3
**Subject:** Basic Science and Technology
**Topic:** Measurement of Mass
**Duration:** 60 minutes
**Lesson Objectives:**
By the end of the lesson, students will be able to:
1. Understand the concept of mass as a measure of how heavy or light an object is.
2. Recognize units of mass such as grams and kilograms.
3. Use a balance scale to measure the mass of different objects.
4. Compare the masses of two or more objects.
**Materials Needed:**
- Balance scales (enough for small groups or pairs)
- Weights or standardized masses (e.g., 100g, 200g, 500g, 1kg)
- Various classroom objects (books, pencils, erasers, toys, etc.)
- Chart paper and markers
- Visual aids (pictures of objects with their mass)
- Worksheets
**Introduction (10 minutes):**
1. **Greeting and Warm-Up:** Start with a friendly greeting and a quick warm-up activity to engage students' interest (e.g., asking them to guess which is heavier between two objects like a pencil and a book).
2. **Introduce the Concept of Mass:** Explain that mass tells us how heavy or light something is. Use simple terms and relatable examples.
**Development (15 minutes):**
1. **Demonstration:** Show a balance scale and explain how it works. Demonstrate by weighing a few classroom objects and show how the balance scale can tip to indicate which object is heavier or lighter.
2. **Introduce Units of Mass:** Explain the units of mass, focusing on grams (g) and kilograms (kg). Show visual aids depicting objects with their corresponding masses for better understanding.
**Guided Practice (15 minutes):**
1. **Group Activity:** Divide students into small groups or pairs. Give each group a balance scale, standardized weights, and a few objects to weigh.
2. **Hands-On Measurement:** Guide students as they use the balance scales to measure the mass of different objects. They should record their findings on a provided worksheet.
**Discussion and Comparison (10 minutes):**
1. **Analyze Findings:** Ask students to share their recorded masses with the class. Discuss the findings and compare the masses of different objects.
2. **Question and Answer:** Encourage students to ask questions and clarify any doubts about measuring mass.
**Independent Practice (5 minutes):**
1. **Worksheet Completion:** Hand out individual worksheets with pictures of objects. Students will estimate the mass of each object and later verify their estimates using the balance scales.
**Conclusion (5 minutes):**
1. **Summary:** Recap the main points of the lesson: the concept of mass, how to measure mass using a balance scale, and the units of mass.
2. **Homework/Extension Activity:** Assign a simple homework task where students find and record the mass of three household items, with their parents' help, and note the units used.
**Assessment:**
- Observe student participation and engagement during the group activity.
- Review the worksheets and check for accuracy and understanding.
- Ask students to orally explain how to measure mass as a quick formative assessment.
**Adaptations for Diverse Learners:**
- Provide additional support for students who may struggle with the concept by working in smaller groups with teacher assistance.
- Use visual aids and hands-on materials to cater to various learning styles.
**Additional Notes:**
- Ensure safety while handling balance scales and weights.
- Encourage collaboration and positive interaction among students during group activities.