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# Basic Technology Lesson Note JSS 2 Second Term

Basic Technology Scheme of Work for JSS2 Second Term

WEEK 1 REVISION OF LAST TERM’S WORK

WEEK 3 PLANE FIGURE

WEEK 4&5 AREA OF PLANE FIGURES

WEEK 6 WOODWORK MACHINES

WEEK 7 METALWORK MACHINES

WEEK 8 METALWORK MACHINES (CONTINUED)

WEEK 9 FRICTION

WEEK 10 FRICTION (CONTINUED)

# Basic Technology JSS2 Second Term

Below are the 2022 complete basic technology lesson notes for Jss 2 Second term

Week 1

TopicRevision of Last Term’s Work

## Definition

A quadrilateral is a closed figure with four straight sides. You can make a quadrilateral by taking (or imagining) anything straight and thin you might have handy: pens, toothpicks, chopsticks, etc. A square is one type of special quadrilateral.

(quad means four, lateral means side).

# PLANE FIGURE

Content:

• POLYGON: Definition
• Types/Sketches
• Construction

## Definition of a Polygon

Polygons are everywhere! A polygon is any 2-dimensional shape formed with straight lines. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. The name tells you how many sides the shape has. For example, a triangle has three sides, and a quadrilateral has four sides. So, any shape that can be drawn by connecting three straight lines is called a triangle, and any shape that can be drawn by connecting four straight lines is called a quadrilateral.

A polygon is a plane figure formed by joining three or more straight sides. A polygon is said to be regular if all its sides are equal and its angles are equal. To learn more, Click here

## Topic: AREA OF PLANE FIGURES

INTRODUCTION

The idea of the area may be explained as the amount of space enclosed within the boundary of a figure. For instance, the area of the floor of a classroom is the amount of space enclosed within the four corners of the room. Also, the area of the top of the teacher’s table is the amount of space enclosed within the edges of the table.

To measure this amount of space, we determine the number of square units. As an example, let us find the area of the rectangular floor of length 10cm and width 6cm. To do this, one method may be to take square cardboard of one-centimetre side and starting from one corner of the floor, mark the outline of the cardboard, edge to edge, until the whole space of the floor is covered. Then the number of the one-square centimetre marking is counted and that gives the area of the floor in square centimetres. To learn more, Click here

## Week 6

Topic: WOODWORK MACHINES

INTRODUCTION

Woodwork machines refer to the common equipment used in the workshop. Most of these machines are heavy and cannot be handled ordinarily. Some of them are fixed on the ground and are used with electric power. A few of these machines will be discussed.

Two sections exist here on this topic:

1. Portable power tools

2. Machines

## Week 7

Topic: METAL WORK MACHINES

Introduction

A machine tool is a machine that cuts metals and performs some other operations by manipulation of its parts. This chapter introduces you to the five basic machines normally regarded as machine tools.

Content:

• Types of metal work
• The centre lathe and its operation

Types of Metalwork

Machines and their Functions

i. Lathe

ii. Shaper and planer

## Week 8

Topic: METAL WORK MACHINES (continued)

Metalwork tools are split into two major categories. The first category includes industrial metalwork tools. They are very advanced and can easily do various jobs with minor help from an engineer. Industrial metalwork tools can easily be referred to as machines. Their prices reach astronomical numbers. If you own such tools, then you probably need a professional to take care of them. They require particular maintenance operations that cannot be done by a regular owner. However, this is a valid statement only if you own a large-scale company or you are… An eccentric person.

A regular person interested in metalworking opts for a different category of tools. Most garage owners don’t usually use them to host their cars inside. Almost every garage has a small area in a corner full of tools. It is a common hobby for men to do various crafting operations. Sometimes they are needed in the house, sometimes they are just fun times. However, such metalwork tools are easier to maintain than industrial machines. Let’s see how. To learn more, Click here

## Week 9

Topic: FRICTION

Definition of Friction

Friction is the resistance to motion of one object moving relative to another. It is not a fundamental force, like gravity or electromagnetism. Instead, scientists believe it is the result of the electromagnetic attraction between charged particles in two touching surfaces.

In liquids, friction is the resistance between moving layers of a fluid, which is also known as viscosity. In general, more viscous fluids are thicker, so honey has more fluid friction than water.

The atoms inside a solid material can experience friction as well. For instance, if a solid block of metal gets compressed, all the atoms inside the material move, creating internal friction.

In nature, there are no completely frictionless environments: even in deep space, tiny particles of matter may interact, causing friction. To learn more, Click here

## Week 10

Topic: FRICTION (Continued)

Reduction of friction

It is beneficial to reduce the friction between surfaces to make movement easier or reduce the wear and tear on a surface. There are a number of ways to reduce friction:

1. Make the surfaces smoother: Rough surfaces produce more friction and smooth surfaces reduce friction. Some swimmers wear suits to reduce underwater resistance. These suits mimic the smooth skin of sharks.

2. Lubrication is another way to make a surface smoother. A lubricant is a slippery substance designed to reduce friction between surfaces. You might use oil to stop a door from squeaking – the oil reduces the friction in the hinge. Water can be used as a lubricant – think of how a floor becomes slippery after it has been mopped.

3. Make the object more streamlined: A streamlined shape is one that allows air or water to flow around it easily, offering the least resistance. Compare a boxy old car with a new car that has a rounded shape, allowing it to move with less effort. To learn more, Click here

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