Lesson Notes By Weeks and Term - Junior Secondary 1

Properties of materials (rubber and plastic)

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TERM – 1ST TERM

WEEK TEN

Class: Junior Secondary School 1

Age: 12 years

Duration: 40 minutes of 5 periods each

Date:

Subject: BASIC TECHNOLOGY

Topic: PROPERTIES OF MATERIAL (RUBBER AND PLASTIC)

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

  1. Describe rubber and plastic
  2. Identify the types of rubber and plastic.
  3. Identify rubber and plastic via their characteristics
  4. Identify the properties of rubber and plastic
  5. Identify the uses of rubber and plastic.

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers,

demonstration, videos from source

INSTRUCTIONAL MATERIALS:  Videos, loud speaker, textbook, pictures, rubber materials, plastic Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

PRESENTATION

TEACHER’S ACTIVITY

STUDENT’S

ACTIVITY

STEP 1

INTRODUCTION

The teacher introduces and describe rubber and plastic using physical materials provided.

Students pay

attention

STEP 2

EXPLANATION

Teacher discusses the characteristics and types of rubber and plastic.

Students pay

attention and

participate

 

STEP 3

DEMONSTRATION

Teacher discusses the properties and uses of rubber and plastic.

Students pay

attention and

participate

STEP 4

NOTE TAKING

The teacher writes a summarized

note on the board

The students

copy the note in

their books

 

NOTE

PROPERTIES OF MATERIAL (RUBBER AND PLASTIC)

Rubber is a flexible and elastic material with various applications. common applications include, making tires, Footwear, sport equipments etc.

Plastic is a versatile synthetic material with numerous applications, commonly, Packaging, Constructions, Consumer Goods, electronics etc.

Identification of Rubber

Rubber can easily be identified from plastic via the following characteristics:

   - Rubber are generally more flexible and elastic.

   - Rubber often has a softer and more tactile feel.

   - Rubber exhibits higher elasticity and can easily return to its original shape.

   - Rubber has a tends to be more resilient to extreme temperatures.

   - Rubber often has a matte or non-shiny appearance.

Types of Rubber

  1. Natural Rubber: Derived from latex of rubber trees, used in tires, gloves, and various products.
  2. Synthetic Rubber: Includes types like styrene-butadiene rubber (SBR) and neoprene, used in tires, hoses, and seals.

Properties of Rubber

  1. Elasticity: Rubber is highly elastic, allowing it to stretch and return to its original shape.
  2. Flexibility: It is flexible and can withstand repeated bending and stretching.
  3. Insulation: Rubber is a good electrical insulator, making it suitable for various applications.
  4. Heat Resistance: Some rubber types can withstand high temperatures.
  5. Tensile Strength: Rubber exhibits good tensile strength, resisting tearing or breaking under tension.

Uses of Rubber

  1. Tires: The primary use of rubber is in the manufacturing of tires for various vehicles.
  2. Footwear: Rubber is commonly used in the production of shoe soles for its flexibility and durability.
  3. Industrial Belts: Used in conveyor belts for its strength and elasticity.
  4. Medical Products: Latex rubber is used in gloves, catheters, and other medical devices.

Identification of Plastic.

Plastic can be easily identified from rubber via the following characteristics:

  - Plastic can be flexible or rigid depending on the type.

   - Plastic can have a smoother or harder texture.

   - Plastic may not rebound as readily and can be more rigid.

   - Plastic can be more susceptible to temperature changes, with some types becoming brittle.

   - Plastic can have a shiny or glossy appearance.

Types of Plastic

  1. Polyethylene (PE): Commonly used in packaging, bottles, and plastic bags.
  2. Polyvinyl Chloride (PVC): Used in pipes, cable insulation, and construction materials.
  3. Polypropylene (PP): Used in packaging, textiles, and automotive components.

Properties of Plastic

  1. Versatility: Plastics are highly versatile and can be molded into various shapes.
  2. Durability: They are generally durable and resistant to wear and tear.
  3. Chemical Resistance: Many plastics are resistant to chemicals, oils, and solvents.
  4. Insulation: Plastics can act as electrical insulators.
  5. Thermal Insulation: Plastics can have good thermal insulation properties.

Uses of Plastic

  1. Packaging: Plastics are extensively used in packaging materials, including bottles, containers, and wraps.
  2. Construction: Used in pipes, insulation, and various construction materials.
  3. Consumer Goods: Plastics are prevalent in everyday items such as toys, kitchenware, and appliances.
  4. Electronics: Plastics are common in electronic devices, casings, and components.

EVALUATION: 1. Differentiate between rubber and plastic.

  1. Mention 5 characteristics of rubber and 5 of plastic
  2. Identify 4 uses of rubber and 4 uses of plastic
  3. Mention 5 properties of rubber and 5 properties of plastic.

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively