Class: Senior Secondary School 1 (SS1, SS 1, SSS1, SSS 1)
Term: First Term
Week: 5
Age: 15 years
Duration: 45 minutes
Subject: Metal Work
Curriculum Theme: Pre-Vocational Studies
Previous Lesson: Types of Metals: Ferrous, Non-Ferrous and Alloys.
Topic: Uses of Metals
Subject Matter: Uses of metals for vehicles, uses of metals for doors and door frames, uses of metals for buildings and bridges, uses of mild steel plates, construction of water tanks, examples of steel cast iron and wrought iron uses.

Specific Objectives

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

Cognitive Domain:

State at least five uses of metals in daily life.
Identify specific metals used in vehicles, doors, buildings, and bridges.
Describe the common applications of mild steel plates.
List key uses of steel, cast iron, and wrought iron.

Affective Domain:

Appreciate the role of metals in various industries and construction.
Show willingness to participate in practical demonstrations related to metalwork.

Psychomotor Domain:

Participate actively in the demonstration of constructing a simple water tank prototype.
Identify different metal samples shown by the teacher.

Collaborate effectively with classmates during group activities and discussions.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Metal Work.
State Unified Scheme of Work for Metal Work SSS 1.
Basic Metalwork for Senior Secondary Schools by A.O. Olaitan.
https://www.google.com/search?q=uses+of+metals+in+vehicles
https://www.google.com/search?q=uses+of+mild+steel

Instructional Materials

The teacher will teach this lesson with the aid of:

Mild steel plate samples.
Pictures of bridges, door frames, and vehicles.
Simple measuring tools (ruler, tape measure).
Marking tools (scriber).
Hand snips or shears (for demonstration).
Safety gloves.
A pre-made simple water tank prototype.

Rationale for the Lesson

This lesson helps pupils understand how metals are used in everyday objects and major structures around them. It enables them to appreciate the importance of metalwork skills in various industries and for practical applications like constructing water tanks.

Prerequisite/Previous Knowledge

Pupils should have basic knowledge of different types of metals and their general properties, as taught in previous lessons.

Lesson Content/Board Summary

Uses of Metals

Uses of Metals in Vehicles

Metals are widely used in the manufacturing of vehicles due to their strength, durability, and ability to be formed into complex shapes.

Examples of uses of metals in vehicles include:

Chassis and body frames (steel, aluminum)
Engine blocks and components (cast iron, aluminum alloys)
Wheels (steel, aluminum alloys)
Exhaust systems (stainless steel)
Nuts, bolts, and other fasteners

Uses of Metals for Doors and Door Frames

Metals provide security, strength, and longevity for doors and frames in residential and commercial buildings.

Common uses are:

Security doors and gates (steel, wrought iron)
Door frames (steel, aluminum)
Hinges, handles, and locks (brass, steel, aluminum)
Grilles and decorative panels

Uses of Metals in Buildings and Bridges

Metals are essential structural components in modern construction due to their high strength-to-weight ratio and versatility.

Key applications include:

Reinforcing bars (reinforcement steel) in concrete structures
Structural beams and columns (steel)
Roofing sheets (aluminum, galvanized steel)
Handrails, balustrades, and gates
Bridge superstructures, cables, and decking (high-strength steel, aluminum)

Uses of Mild Steel Plates

Mild steel is a widely used metal because it is relatively inexpensive, easy to work with, and weldable.

Uses of mild steel plates include:

Fabrication of storage tanks (e.g., water tanks, fuel tanks)
Construction of machinery parts and equipment casings
Building cladding and panels
Making toolboxes, cabinets, and general workshop items
Automotive body panels

Construction of Water Tanks (Prototype)

Water tanks are containers designed for storing water, often fabricated from mild steel plates. Constructing a simple prototype helps to understand the basic principles.

The basic steps for constructing a simple water tank prototype involve:

Measuring and marking the mild steel plate according to design specifications.
Cutting the plate to the required dimensions for the body, base, and lid.
Bending or folding the plate to form the cylindrical or rectangular tank shape.
Joining the edges, which could be by welding for a real tank or using adhesives/fasteners for a prototype.
Attaching the base and lid, and ensuring they are properly sealed.

Specific Uses of Steel, Cast Iron, and Wrought Iron

Steel: An alloy of iron and carbon, known for its high strength, versatility, and ability to be heat-treated.
- Uses: Structural frameworks for buildings, car bodies, tools, cutlery, machinery parts, railway tracks, pipelines.
Cast Iron: An iron alloy with a relatively high carbon content (2-4%), which makes it hard and brittle but good under compression.
- Uses: Engine blocks, machine bases, manhole covers, pipes, heavy machinery components, frying pans, decorative castings.
Wrought Iron: Nearly pure iron with very low carbon content, known for being tough, malleable, and ductile. It is easily forged and welded.
- Uses: Gates, railings, decorative ironwork, fences, chains, garden furniture, historical tools.

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 reviews the previous lesson on types and properties of metals. The teacher then asks pupils to mention any metal objects they see around them in the classroom or outside, leading them to the topic of “Uses of Metals”.
Pupils’ Activity: Pupils respond to the teacher’s questions and mention various metal objects.
Learning Point: Pupils recall previous knowledge and are introduced to the new topic.

Step 2: Uses of Metals in Vehicles

Time: 7 minutes
Teaching Skill: Explanation/Illustration
Teacher’s Activity: The teacher explains the various uses of metals in vehicle manufacturing, showing pictures of different vehicle parts made from metal. The teacher asks pupils to identify the specific metals used for different parts if they know.
Pupils’ Activity: Pupils listen, observe the pictures, and contribute by identifying metals or vehicle parts.
Learning Point: Pupils learn about the application of metals in the automotive industry.

Step 3: Uses of Metals for Doors and Door Frames, Buildings and Bridges

Time: 7 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains how metals are used for doors, door frames, and in the construction of buildings and bridges. The teacher uses pictures of metal doors, frames, building structures, and bridges to illustrate these uses.
Pupils’ Activity: Pupils pay attention, ask questions for clarification, and observe the visual aids.
Learning Point: Pupils understand the structural and security applications of metals in construction.

Step 4: Uses of Mild Steel Plates and Construction of Water Tanks

Time: 8 minutes
Teaching Skill: Demonstration/Practical Application
Teacher’s Activity: The teacher discusses the versatile uses of mild steel plates. The teacher then uses mild steel plate samples and simple measuring tools to demonstrate how a simple water tank prototype can be constructed, highlighting the basic steps involved.
Pupils’ Activity: Pupils observe the mild steel samples and the demonstration attentively, asking questions about the process.
Learning Point: Pupils learn about the specific uses of mild steel and the basic principles of fabricating a simple structure like a water tank.

Step 5: Specific Uses of Steel, Cast Iron, and Wrought Iron

Time: 7 minutes
Teaching Skill: Elaboration/Comparison
Teacher’s Activity: The teacher elaborates on the specific uses of steel, cast iron, and wrought iron, highlighting their distinct properties and applications with examples. The teacher encourages pupils to compare their uses.
Pupils’ Activity: Pupils listen, take notes, and compare the uses of the different types of iron.
Learning Point: Pupils differentiate between the applications of various iron-based metals.

Step 6: Class Discussion and Activity

Time: 5 minutes
Teaching Skill: Facilitation/Engagement
Teacher’s Activity: The teacher organizes a brief class discussion, allowing pupils to ask questions, share observations, and discuss the importance of metalwork in their community. The teacher guides them to mention other metal objects not covered.
Pupils’ Activity: Pupils actively participate in the discussion, ask questions, and contribute their ideas.
Learning Point: Pupils consolidate their understanding and engage in critical thinking.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

Mention three uses of metals in vehicles.
List two applications of metals in building construction.
State two common uses of mild steel plates.
Differentiate between the uses of cast iron and wrought iron.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 1 minute
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key points of the lesson, emphasizing the widespread and important uses of metals in various aspects of daily life and industry. The teacher gives pupils homework to identify five metal objects in their homes and state their uses.
Pupils’ Activity: Pupils listen to the summary and copy down the homework.
Learning Point: Pupils reinforce their learning and are given a task to apply knowledge.

Lesson Keywords

Steel – An alloy of iron and carbon, known for its strength and versatility.
Cast Iron – An iron alloy with high carbon content, brittle but strong under compression.
Wrought Iron – Nearly pure iron, tough, malleable, and ductile.
Mild Steel – A common type of steel that is easy to work with and weldable.
Fabrication – The process of constructing products from various raw materials.

Differentiation

The teacher will use visual aids like pictures and actual metal samples to support visual learners. Kinesthetic learners will benefit from the demonstration of the water tank prototype construction and the opportunity to handle metal samples. Group discussions will cater to social learners, while direct questioning will engage all pupils. Additional support will be provided to struggling pupils through peer tutoring and simplified explanations.

Note for teachers using this lesson plan

Teachers should ensure safety precautions are observed, especially during the demonstration of working with mild steel plates. Handling of sharp edges or tools should be done by the teacher or under strict supervision. Encourage pupils to bring pictures of metal objects from their environment. Emphasize the practical relevance of each use discussed to make the lesson more engaging for the pupils.