Foundations of Pre-Technical Studies

Fire Safety - Meaning and importance of fire

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

- Define fire and describe its role in the work environment
- Identify uses of fire in day-to-day life
- Show interest in learning about fire safety

In groups, learners are guided to:
- Brainstorm on the meaning of fire and the fire triangle (fuel, heat, oxygen)
- Discuss the importance of fire in a work environment
- Share experiences on how fire is used at home and in the community

What is fire and why is it important in day-to-day life?

- Longhorn Pre-Technical Studies Grade 8 pg. 1
- Digital resources and internet access
- Charts showing the fire triangle

- Oral questions - Observation

Foundations of Pre-Technical Studies

Fire Safety - Causes of fire outbreaks

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

- Identify flammable substances as causes of fire outbreaks
- Explain how flammable materials lead to fire outbreaks
- Appreciate the danger of mishandling flammable substances

In groups, learners are guided to:
- Discuss and identify flammable substances in the environment (petrol, kerosene, gas)
- Use pictures to explain how flammable substances cause fire outbreaks
- Share experiences of fire incidents linked to flammable materials

How do flammable substances cause fire outbreaks in the environment?

- Longhorn Pre-Technical Studies Grade 8 pg. 2
- Pictures and charts of flammable substances
- Digital resources

- Oral questions - Observation

Foundations of Pre-Technical Studies

Fire Safety - Causes of fire outbreaks

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

- Identify electrical faults and combustible materials as causes of fire
- Explain how electrical faults and combustible materials lead to fire outbreaks
- Recognise the importance of checking electrical installations regularly

In groups, learners are guided to:
- Use visual aids to identify electrical faults that cause fires (overloading sockets, faulty wiring)
- Discuss combustible materials and how they ignite
- Role-play identifying fire hazards in a classroom or home setting

How do electrical faults contribute to fire outbreaks in the environment?

- Longhorn Pre-Technical Studies Grade 8 pg. 3
- Pictures of electrical faults
- Digital devices for video clips

- Observation - Oral questions

Foundations of Pre-Technical Studies

Fire Safety - Ways of preventing fire outbreaks

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

- Explain ways of preventing fire outbreaks in the environment
- Apply fire prevention measures in the work environment
- Appreciate the importance of fire prevention for safety

In groups, learners are guided to:
- Discuss a fire safety checklist and explain how each tip prevents fire outbreaks
- Share personal experiences or school-based fire safety measures
- Brainstorm additional fire prevention measures for different environments

What measures can be taken to prevent fire outbreaks in the work environment?

- Longhorn Pre-Technical Studies Grade 8 pg. 4
- Fire safety checklist posters
- Internet access and reference books

- Written test - Oral questions

Foundations of Pre-Technical Studies

Fire Safety - Firefighting techniques

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

- Describe the cooling and smothering firefighting techniques
- Explain how each method works to extinguish fire
- Show willingness to apply firefighting techniques safely

In groups, learners are guided to:
- Use audio-visual aids to observe cooling (reducing temperature) and smothering (reducing oxygen) in action
- Discuss how each method is applied and the type of fire each suits
- Demonstrate cooling using water on a small simulated fire scenario

How are the cooling and smothering methods used to extinguish fire?

- Longhorn Pre-Technical Studies Grade 8 pg. 5
- Video clips on firefighting methods
- Charts showing firefighting techniques

- Observation - Oral questions

Foundations of Pre-Technical Studies

Fire Safety - Firefighting techniques

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

- Describe the starving and interrupting firefighting techniques
- Explain the situations in which each technique is applied
- Acknowledge the need to choose the correct technique for each fire type

In groups, learners are guided to:
- Use pictures to identify the starving (removing fuel) and interrupting (chemical reaction) methods
- Discuss the applications of each technique in different fire scenarios
- Make summary notes comparing all four firefighting methods

In what situations is the starving method more suitable than other firefighting techniques?

- Longhorn Pre-Technical Studies Grade 8 pg. 6
- Charts of firefighting methods
- Digital devices for video clips

- Oral questions - Written assignments

Foundations of Pre-Technical Studies

Fire Safety - Extinguishing fires in the environment

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

- Demonstrate firefighting techniques through role-play
- Explain how to use a fire extinguisher correctly
- Show responsibility when handling firefighting equipment

In groups, learners are guided to:
- Role-play the four firefighting methods in groups using simulated scenarios
- Discuss how to operate a fire extinguisher step by step
- Describe how to respond to a fire outbreak in the school environment

How would you respond to a fire outbreak in your school environment?

- Longhorn Pre-Technical Studies Grade 8 pg. 7
- Fire extinguisher (demonstration model)
- Video link: https://youtu.be/DyNuPLipNAO

- Observation - Practical assessment

Foundations of Pre-Technical Studies

Fire Safety - Importance of observing fire safety

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

- Explain the importance of observing fire safety in day-to-day life
- Relate fire safety practices to protection of lives, property and the environment
- Commit to sensitising the community on fire safety

In groups, learners are guided to:
- Discuss a fire safety poster highlighting the benefits of fire safety measures
- Explain how fire safety protects lives, prevents property damage, reduces injuries and protects the environment
- Discuss how to sensitise family and community members on fire safety

Why is it important for everyone to observe fire safety at home and in the work environment?

- Longhorn Pre-Technical Studies Grade 8 pg. 8
- Fire safety posters and flyers
- Internet access

- Oral questions - Written test

Foundations of Pre-Technical Studies

Data Safety - Meaning of data and information

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

- Distinguish between data and information in electronic devices
- Explain the relationship between raw data and processed information
- Show interest in understanding how data is handled in devices

In groups, learners are guided to:
- Use a dictionary or internet to search for meanings of data and information
- Discuss the difference between data (raw facts) and information (processed, meaningful output)
- Share findings with peers and present examples of data and information in everyday devices

What is the difference between data and information in an electronic device?

- Longhorn Pre-Technical Studies Grade 8 pg. 10
- Digital devices (computer, smartphone, tablet)
- Internet access and reference books

- Oral questions - Observation

Foundations of Pre-Technical Studies

Data Safety - Importance of data in an electronic device
Data Safety - Threats to data in an electronic device

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

- Outline the importance of data in electronic devices
- Discuss different ways data is used within electronic devices
- Appreciate why data management is essential in modern life

In groups, learners are guided to:
- Study and discuss a chart showing the importance of data in electronic devices
- Brainstorm additional importances of data beyond those in the chart
- Complete the chart by filling in examples and present findings to the class

Why is data important in electronic devices used in day-to-day life?

- Longhorn Pre-Technical Studies Grade 8 pg. 11
- Digital devices
- Charts on importance of data
- Longhorn Pre-Technical Studies Grade 8 pg. 12
- Internet access

- Oral questions - Written assignments

Foundations of Pre-Technical Studies

Data Safety - Threats to data in an electronic device

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

- Identify physical theft, human error and hardware failure as threats to data
- Explain how each threat leads to loss or compromise of data
- Appreciate the need for comprehensive data protection strategies
- Discuss real-life examples of each threat from their own experience

In groups, learners are guided to:
- Discuss how physical theft puts device data at risk
- Explain how accidental deletion (human error) and hardware failure cause data loss
- Share and discuss real-life examples of these threats with peers

In what ways can human actions lead to permanent loss of data on a device?

- Longhorn Pre-Technical Studies Grade 8 pg. 12
- Reference books and digital resources
- Internet access

- Observation - Oral questions

Foundations of Pre-Technical Studies

Data Safety - Ways of protecting data in an electronic device

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

- Explain the importance of using passwords to protect data
- Describe the features of a strong password
- Show responsibility in creating and managing secure passwords

In groups, learners are guided to:
- Discuss how passwords protect electronic devices and accounts from unauthorised access
- Analyse the characteristics of a strong password (mix of letters, numbers, special characters)
- Discuss common password mistakes and how to avoid them

What makes a password strong enough to protect data in an electronic device?

- Longhorn Pre-Technical Studies Grade 8 pg. 13
- Digital devices
- Internet access

- Oral questions - Written test

Foundations of Pre-Technical Studies

Data Safety - Ways of protecting data in an electronic device

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

- Explain how antivirus scanning protects data from viruses
- Describe the role of regular data backup in preventing data loss
- Appreciate the importance of combining multiple data protection strategies

In groups, learners are guided to:
- Discuss how antivirus software detects and removes viruses from electronic devices
- Explain the importance of backing up data to prevent loss from device failure or theft
- Discuss a poster on cyber security tips and link each tip to a specific threat

How does regular antivirus scanning help protect data in an electronic device?

- Longhorn Pre-Technical Studies Grade 8 pg. 13
- Antivirus software samples
- Digital devices and internet access

- Oral questions - Observation

Foundations of Pre-Technical Studies

Data Safety - Securing data in an electronic device

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

- Demonstrate how to create a strong password and apply it to a Word document
- Follow correct steps to encrypt a document using a password
- Show responsibility when securing personal files on a computer

In groups, learners are guided to:
- Create a strong password using a mix of letters, numbers and special characters
- Follow the step-by-step process to protect a Word document using the Encrypt with Password option
- Save and reopen the document to confirm the password is active

How do you protect a Word document with a password to secure its data?

- Longhorn Pre-Technical Studies Grade 8 pg. 14
- Computers with Microsoft Word installed
- Digital devices

- Practical assessment - Observation

Foundations of Pre-Technical Studies

Data Safety - Securing data in an electronic device

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

- Demonstrate how to scan an electronic device for viruses using Windows Security
- Follow the correct steps to initiate a virus and threat protection scan
- Appreciate the importance of regular virus scanning for data safety

In groups, learners are guided to:
- Navigate to Windows Security on a computer and locate the Virus & Threat Protection option
- Initiate a Quick Scan or full scan and observe the process
- Discuss how the same principle applies to antivirus apps on smartphones and tablets

Why is it important to regularly scan an electronic device for viruses and malware?

- Longhorn Pre-Technical Studies Grade 8 pg. 15
- Computers with Windows Security
- Digital devices

- Practical assessment - Observation

Foundations of Pre-Technical Studies

Data Safety - Importance of data safety

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

- Explain the importance of data safety in day-to-day life
- Relate data safety to prevention of financial loss, identity theft and exposure of personal information
- Commit to practising data safety measures in personal device use

- Read and discuss a scenario of Grade 8 learners discussing the importance of data safety
- Explain how each benefit (financial protection, personal information, identity security) is achieved through data safety
- Discuss ways of helping family members secure data on their mobile phones

How does observing data safety protect individuals from financial loss and identity theft?

- Longhorn Pre-Technical Studies Grade 8 pg. 16
- Digital devices
- Internet access and reference books

- Oral questions - Written test

Foundations of Pre-Technical Studies

Data Safety - Securing data in an electronic device

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

- Consolidate understanding of data, threats, protection methods and importance of data safety
- Apply data safety knowledge to solve given scenarios
- Show confidence in securing electronic devices independently

In groups, learners are guided to:
- Review key concepts: data vs information, threats, protection techniques and their importance
- Answer scenario-based questions (e.g. headteacher's new laptop, smartphone virus threat)
- Peer-assess responses and provide constructive feedback on answers

How would you advise a person who has just bought a new device to keep their data safe?

- Longhorn Pre-Technical Studies Grade 8 pg. 17
- Exercise books for written responses
- Digital devices for reference

- Written assignments - Peer and self-assessment

Foundations of Pre-Technical Studies

Data Safety - Securing data in an electronic device

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

- Consolidate understanding of data, threats, protection methods and importance of data safety
- Apply data safety knowledge to solve given scenarios
- Show confidence in securing electronic devices independently

In groups, learners are guided to:
- Review key concepts: data vs information, threats, protection techniques and their importance
- Answer scenario-based questions (e.g. headteacher's new laptop, smartphone virus threat)
- Peer-assess responses and provide constructive feedback on answers

How would you advise a person who has just bought a new device to keep their data safe?

- Longhorn Pre-Technical Studies Grade 8 pg. 17
- Exercise books for written responses
- Digital devices for reference

- Written assignments - Peer and self-assessment

Communication in Pre-Technical Studies

Plane Geometry - Drawing instruments and materials

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

- Identify drawing instruments and materials used in plane geometry
- State the use of each drawing instrument
- Show interest in the correct selection of drawing instruments

In groups, learners are guided to:
- Observe and discuss drawing instruments and materials shown in Figure 1
- Identify each instrument and state its specific use
- Discuss which three instruments are most suitable for drawing parallel lines

Which instrument would you use to draw a perfect straight line and why?

- Longhorn Pre-Technical Studies Grade 8 pg. 18
- Drawing instruments (pencils, set squares, ruler)
- Digital resources

- Oral questions - Observation

Communication in Pre-Technical Studies

Plane Geometry - Drawing instruments and materials

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

- Distinguish between H series, B series and HB pencils and their uses
- Identify types of set squares and describe their functions
- Appreciate the importance of selecting the correct pencil grade for drawing

In groups, learners are guided to:
- Discuss the grades and uses of H, B and HB series pencils using Figure 2
- Identify the two types of set squares (45° and 30°/60°) and state their uses
- Practise using set squares to draw angles and parallel lines

How does the grade of a pencil affect the quality of a technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 19
- Pencils of various grades
- Set squares

- Observation - Oral questions

Communication in Pre-Technical Studies

Plane Geometry - Drawing instruments and materials

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

- Identify instruments in a geometrical drawing set
- Explain the use of compasses, dividers and a ruler in drawing
- Show responsibility in handling and storing drawing instruments

In groups, learners are guided to:
- Discuss the components of a geometrical drawing set (compasses, dividers, ruler)
- Explain the use of compasses for drawing circles and arcs
- Explain the use of dividers for transferring measurements and dividing lines

What is the difference between compasses and dividers in a drawing set?

- Longhorn Pre-Technical Studies Grade 8 pg. 20
- Geometrical drawing set
- Charts showing drawing instruments

- Oral questions - Observation

Communication in Pre-Technical Studies

Plane Geometry - Layout of a drawing environment

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

- Describe the requirements for setting up a drawing environment
- Explain the importance of a flat, clean and smooth drawing surface
- Show willingness to set up a drawing environment correctly

In groups, learners are guided to:
- Use the Internet or reference books to search for information on setting up a drawing environment
- Write and share summary notes on drawing environment requirements
- Discuss why a clean, flat surface improves drawing accuracy

Why is it important to set up a proper drawing environment before starting a technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 21
- Internet access and reference books
- Drawing boards and paper

- Oral questions - Written assignments

Communication in Pre-Technical Studies

Plane Geometry - Layout of a drawing environment

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

- Set up drawing paper correctly with margins and a title block
- Identify the information recorded in a title block
- Appreciate the role of a title block in organising technical drawings

In groups, learners are guided to:
- Follow steps to place paper on drawing board, draw margin lines 15 mm from edges
- Draw and fill in the title block in the lower right corner of the paper
- Discuss the five items recorded in a title block (name, class, date, title, scale)

What information is included in a title block and why is each item important?

- Longhorn Pre-Technical Studies Grade 8 pg. 22
- Drawing paper (A3)
- Pencils, ruler and set squares

- Observation - Practical assessment

Communication in Pre-Technical Studies

Plane Geometry - Construction of combined shapes

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

- Construct a triangle inscribed in a circle using drawing instruments
- Draw combined shapes on a correctly set up paper layout
- Show precision and care when constructing geometric shapes

In groups, learners are guided to:
- Discuss how to draw combined shapes from Figure 8
- Construct a triangle inscribed in a circle following given steps
- Draw combined shapes on the paper layout prepared in the previous lesson

How are combined geometric shapes constructed accurately using drawing instruments?

- Longhorn Pre-Technical Studies Grade 8 pg. 24
- Geometrical drawing set
- Drawing paper with prepared layout

- Observation - Practical assessment

Communication in Pre-Technical Studies

Plane Geometry - Construction of combined shapes

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

- Construct a square inscribed in a circle
- Construct a combined shape by joining a rectangle and a triangle
- Construct a kite given the lengths of its diagonals

In groups, learners are guided to:
- Follow the four steps to inscribe a square in a circle (diagonal PS = 64 mm)
- Construct the rectangle-triangle combined shape following steps (a)–(f)
- Construct kite PQRS with diagonals PR = 64 mm and SQ = 38 mm

How does bisecting a line help in constructing shapes inscribed in a circle?

- Longhorn Pre-Technical Studies Grade 8 pg. 27
- Geometrical drawing set and drawing paper
- Ruler and compasses

- Practical assessment - Observation

Communication in Pre-Technical Studies

Plane Geometry - Use of plane geometry in drawing

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

- Identify areas where plane geometry is applied in drawings
- Explain how plane geometry provides basic shapes, accurate proportions and precise constructions
- Appreciate the relevance of plane geometry in day-to-day technical work

In groups, learners are guided to:
- Study Kevin's house drawing and discuss how plane geometry is applied
- Identify basic geometric shapes in technical drawings (rectangles, circles, triangles)
- Use the Internet to search for more information on plane geometry applications in drawing

How is plane geometry applied to create accurate and proportional technical drawings?

- Longhorn Pre-Technical Studies Grade 8 pg. 29
- Internet access and reference books
- Charts showing plane geometry applications

- Oral questions - Observation

Communication in Pre-Technical Studies

Plane Geometry - Drawing instruments and materials

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

- Name instruments and materials used in drawing from observation
- Set up drawing paper and construct combined shapes independently
- Show confidence in applying plane geometry skills

In groups, learners are guided to:
- Name instruments shown in exercise figures (a), (b), (c)
- Sketch two plane figures using a pencil
- Construct a combined shape (rectangle + triangle) and a circle inscribed in a triangle of side 70 mm

How do you determine the appropriate instruments to use for a specific drawing task?

- Longhorn Pre-Technical Studies Grade 8 pg. 31
- A3 drawing paper and geometrical set
- Pencils and ruler

- Written test - Practical assessment

Communication in Pre-Technical Studies

Dimensioning - Meaning and types of dimensioning

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

- Define the term dimensioning as used in technical drawing
- Identify the types of dimensioning in drawing
- Show interest in understanding how dimensions communicate information in drawings

In groups, learners are guided to:
- Read about dimensioning from Rita's tablet activity and discuss the meaning
- Explain the meaning of dimensioning in own words
- Search the Internet for information on different types of dimensioning

What is dimensioning and why is it important in technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 32
- Digital devices and internet access
- Charts and drawings with dimensions

- Oral questions - Observation

Communication in Pre-Technical Studies

Dimensioning - Types of dimensioning

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

- Describe linear dimensioning and explain where it is used
- Describe radial dimensioning and explain where it is used
- Distinguish between linear and radial dimensioning in drawings

In groups, learners are guided to:
- Discuss how linear dimensioning measures straight-line distances between two points
- Use Figure 1 to study examples of linear dimensioning (horizontal, vertical, inclined)
- Use Figure 2 to study radial dimensioning of arcs and circles

How does radial dimensioning differ from linear dimensioning in a technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 33
- Drawing charts showing linear and radial dimensioning
- Digital devices

- Oral questions - Written assignments

Communication in Pre-Technical Studies

Dimensioning - Types of dimensioning
Dimensioning - Lines used for dimensioning

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

- Describe angular dimensioning and explain where it is applied
- Describe arc length dimensioning and explain where it is applied
- Categorise types of dimensioning from given technical drawings

In groups, learners are guided to:
- Use Figure 3 to study angular dimensioning — specifying angles between two lines
- Use Figure 4 to study arc length dimensioning — specifying the exact length of an arc
- Identify and categorise the type of dimensioning used in given drawings

In what situations would you use angular dimensioning instead of linear dimensioning?

- Longhorn Pre-Technical Studies Grade 8 pg. 34
- Drawing charts showing angular and arc dimensioning
- Digital devices and reference books
- Longhorn Pre-Technical Studies Grade 8 pg. 35
- Drawing paper and pencils
- Charts showing dimensioning line types

- Oral questions - Observation

Communication in Pre-Technical Studies

Dimensioning - Lines used for dimensioning

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

- Draw dimension lines, extension lines and leader lines on given shapes
- Label each type of dimensioning line correctly
- Show precision when adding dimensioning lines to technical drawings

In groups, learners are guided to:
- Draw a rectangle and add dimension lines with arrowheads for length and width
- Add two extension lines for each dimension line drawn
- Draw a leader line pointing to the top surface of the rectangle and label it

How do you correctly draw and label dimensioning lines on a technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 36
- Drawing paper, pencils and ruler
- Set squares and geometrical set

- Practical assessment - Observation

Communication in Pre-Technical Studies

Dimensioning - Dimensioning a given shape

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

- Identify the parallel method of dimensioning
- Apply the parallel dimensioning method to dimension given shapes
- Appreciate the importance of consistent dimensioning methods in technical drawings

In groups, learners are guided to:
- Study and identify the parallel dimensioning method from given drawings (a), (b), (c)
- Explain the difference between parallel and chain dimensioning from the drawings
- Apply the parallel method to dimension a shape on drawing paper

When would a drafter prefer the parallel dimensioning method over the chain method?

- Longhorn Pre-Technical Studies Grade 8 pg. 37
- Drawing paper, pencils and ruler
- Charts showing dimensioning methods

- Observation - Oral questions

Communication in Pre-Technical Studies

Dimensioning - Dimensioning a given shape

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

- Apply the chain dimensioning method to given shapes
- Apply the combined dimensioning method to given shapes
- Develop a portfolio of dimensioned drawings using different methods

In groups, learners are guided to:
- Trace outlines of given drawings onto paper
- Measure dimensions in millimetres and apply the chain method
- Apply the combined dimensioning method and compile drawings into a portfolio

How does the combined dimensioning method incorporate both parallel and chain methods?

- Longhorn Pre-Technical Studies Grade 8 pg. 37
- Drawing paper, pencils and geometrical set
- Portfolio folder

- Portfolio - Practical assessment

Communication in Pre-Technical Studies

Dimensioning - Dimensioning a given shape

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

- Measure dimensions of given drawings using a ruler
- Dimension the drawings correctly using appropriate methods
- Show accuracy and neatness in dimensioned drawings

In groups, learners are guided to:
- Use a ruler to measure dimensions of drawings (a) and (b) in Activity 5
- Draw the shapes on paper and dimension each drawing correctly
- Trace outlines of drawings (a) and (b) in Activity 6 and apply parallel, chain or combined methods

How do you decide which dimensioning method is most appropriate for a given shape?

- Longhorn Pre-Technical Studies Grade 8 pg. 38
- Drawing paper, pencils and ruler
- Geometrical set

- Practical assessment - Observation

Communication in Pre-Technical Studies

Dimensioning - Importance of dimensioning

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

- Explain the importance of dimensioning in technical drawings
- Relate dimensioning to accuracy, manufacturing guidance and object description
- Appreciate that dimensions make technical drawings complete and useful

In groups, learners are guided to:
- Identify the dimensioning method used in given drawings
- Discuss the three reasons why dimensioning is important (accuracy, manufacturing guidance, object description)
- Measure the classroom floor and make a dimensioned scale drawing

How does dimensioning a drawing make it more useful in construction and manufacturing?

- Longhorn Pre-Technical Studies Grade 8 pg. 40
- Tape measure and drawing paper
- Pencils and ruler

- Oral questions - Written test

Communication in Pre-Technical Studies

Dimensioning - Types of dimensioning

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

- Define dimensioning and name the parts of a dimension
- Measure and dimension plane figures using different methods
- Show confidence in identifying and applying dimensioning types

In groups, learners are guided to:
- Define dimensioning in own words
- Name the parts marked with letters in the given dimension figure
- Measure and dimension plane figures using parallel, chain or combined methods

How do you determine the correct type of dimensioning to apply to a given drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 41
- Drawing paper, pencils and ruler
- Geometrical set

- Written test - Practical assessment

Communication in Pre-Technical Studies

Plain Scale Drawing - Features of a plain scale

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

- Define a plain scale and explain its purpose in drawing
- Identify the features of a plain scale from a given diagram
- Show interest in learning how scales are used in technical drawing

In groups, learners are guided to:
- Use a dictionary or Internet to find the meaning of a plain scale
- Discuss what can be observed on a plain scale from the diagram provided
- Identify two sets of divisions, labels, the representative fraction (R.F.) and the zero point

What is a plain scale and why is it used in technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 42
- Plain scale diagrams and charts
- Internet access and reference books

- Oral questions - Observation

Communication in Pre-Technical Studies

Plain Scale Drawing - Features of a plain scale

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

- Define a plain scale and explain its purpose in drawing
- Identify the features of a plain scale from a given diagram
- Show interest in learning how scales are used in technical drawing

In groups, learners are guided to:
- Use a dictionary or Internet to find the meaning of a plain scale
- Discuss what can be observed on a plain scale from the diagram provided
- Identify two sets of divisions, labels, the representative fraction (R.F.) and the zero point

What is a plain scale and why is it used in technical drawing?

- Longhorn Pre-Technical Studies Grade 8 pg. 42
- Plain scale diagrams and charts
- Internet access and reference books

- Oral questions - Observation

Communication in Pre-Technical Studies

Plain Scale Drawing - Features of a plain scale

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

- Describe the four features of a plain scale
- Explain the role of the representative fraction (R.F.) on a plain scale
- Appreciate that the zero point is the reference for all measurements on a plain scale

In groups, learners are guided to:
- Discuss the four features: two sets of divisions, labelled numbers, R.F. and zero point
- Explain the difference between main divisions (e.g. metres) and subdivisions (e.g. decimetres)
- Discuss how the direction from the zero point determines the unit being measured

How does the representative fraction help us understand the relationship between a drawing and the real object?

- Longhorn Pre-Technical Studies Grade 8 pg. 43
- Plain scale diagrams
- Drawing instruments

- Oral questions - Written assignments

Communication in Pre-Technical Studies

Plain Scale Drawing - Interpreting a plain scale

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

- Construct a plain scale given the representative fraction
- Interpret the divisions on a plain scale to read measurements
- Show precision when constructing and labelling a plain scale

In groups, learners are guided to:
- Construct a plain scale with R.F. to measure length in metres and decimetres
- Label the main divisions and subdivisions correctly
- Measure the divisions using a ruler and confirm the R.F. from the scale constructed

How do you use the representative fraction to construct a plain scale correctly?

- Longhorn Pre-Technical Studies Grade 8 pg. 44
- Drawing instruments and paper
- Ruler and pencil

- Practical assessment - Observation