### Lesson Plan: Uses of Materials II
#### **Grade Level:** Junior Secondary 2
#### **Subject:** Basic Technology
#### **Duration:** 45 minutes
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#### **Lesson Objectives:**
By the end of this lesson, students will be able to:
1. Identify different types of materials used in technology (including metals, plastics, ceramics, and composites).
2. Describe the main uses and properties of these materials.
3. Understand the environmental impact of using different materials.
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#### **Materials Needed:**
1. Samples of materials (e.g., metal spoon, plastic bottle, ceramic mug, fiberglass piece)
2. Whiteboard and markers
3. Projector for visual aids (if available)
4. Handout with a table of materials, properties, and uses
5. Videos or images showcasing material uses and impact
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#### **Lesson Sequence:**
##### **Introduction (10 minutes):**
1. **Greeting and Attendance:**
- Welcome students and take attendance.
2. **Review:**
- Briefly review the previous lesson on the basic concepts of materials and their properties.
3. **Introduction to New Topic:**
- Introduce "Uses of Materials II." Mention the importance of understanding material properties for their application in technology.
- Show real-life examples like smartphones, cars, and buildings, and ask students which materials they think are used in these items.
##### **Instructional Input (15 minutes):**
1. **Material Types and Properties:**
- **Metals:**
- Properties (conductivity, malleability, strength)
- Uses (construction, electronics, transportation)
- **Plastics:**
- Properties (lightweight, flexibility, durability)
- Uses (packaging, household items, toys)
- **Ceramics:**
- Properties (brittle, heat-resistant)
- Uses (dishes, tiles, electronics)
- **Composites:**
- Properties (combination of materials for enhanced properties)
- Uses (aerospace, sporting goods, automotive parts)
2. **Show Samples:**
- Pass around samples of each material for students to examine.
3. **Environmental Impact:**
- Discuss the impact of material use on the environment, touching on recycling, pollution, and sustainable alternatives.
##### **Guided Practice (10 minutes):**
1. **Class Discussion:**
- Engage students in a discussion about why certain materials are chosen for specific applications.
- Ask questions like, "Why do you think metals are used in building skyscrapers?" and "What are some challenges of using plastics?"
2. **Visual Aids:**
- Show a short video or images illustrating the extraction, use, and disposal of different materials.
##### **Independent Practice (5 minutes):**
1. **Worksheet/Table:**
- Distribute the handout with a table of materials. Have students fill in the uses and properties for each material using what they have learned.
2. **Group Activity:**
- Divide students into small groups and assign each group a material. Ask them to list as many everyday items made from their material as they can and discuss whether there are more sustainable alternatives.
##### **Closure (5 minutes):**
1. **Summary:**
- Summarize key points of the lesson, emphasizing the properties and uses of each material.
2. **Question & Answer:**
- Allow students to ask any questions and provide clarifications.
3. **Preview Next Lesson:**
- Briefly introduce the next topic (could be related to material processing or advanced materials).
##### **Assessment:**
1. **Formative Assessment:**
- Observe student participation and understanding during class discussions and group activities.
2. **Summative Assessment:**
- Collect and review the completed worksheets for comprehension of material properties and uses.
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#### **Homework Assignment:**
1. **Research Activity:**
- Ask students to research one innovative material (e.g., biodegradable plastics, graphene) and prepare a short presentation on its properties, uses, and benefits for the environment.
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#### **Differentiation:**
1. **For Advanced Students:**
- Provide additional reading materials on advanced materials like nanomaterials or smart materials.
2. **For Students Needing Extra Support:**
- Offer a simplified version of the handout and provide one-on-one or small group assistance as needed.
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By following this lesson plan, students will gain a deeper understanding of different materials used in technology, their applications, and their impact on the environment.