Class: Junior Secondary School 2 (JSS 2 / JS2)
Term: Third Term
Week: 9
Age: 13 years
Duration: 45 minutes
Subject: Basic Science and Technology
Curriculum Theme: Computer Studies / Information Technology
Previous Lesson: Computer Ethics: Abuse/misuse of Computers.
Topic: SAFETY MEASURES
Subject Matter: The sitting posture. Using the anti, Glare protector: Positioning of monitor base

Specific Objectives

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

Cognitive Domain:

Define good sitting posture.
Explain the importance of using an anti-glare protector.
Describe the correct positioning of a computer monitor base.

Affective Domain:

Appreciate the importance of safety measures when using computers.
Show willingness to adopt good ergonomic practices.
Value the need for protecting their eyes and body while working with computers.

Psychomotor Domain:

Demonstrate the correct sitting posture at a computer.
Identify and explain the function of an anti-glare protector.
Adjust a monitor to the appropriate height and distance.

Share knowledge about computer safety measures with peers.
Promote safe and healthy computer usage habits among others.

Reference Materials

The following resources were used in planning this lesson:

9 Years Basic Education Curriculum for Basic Science and Technology JSS 2.
State Unified Scheme of Work for Basic Science and Technology JSS 2.
Basic Science and Technology for Junior Secondary Schools 2.

Instructional Materials

The teacher will teach this lesson with the aid of:

A computer system (desktop or laptop).
An anti-glare protector.
A chart illustrating correct and incorrect sitting postures.
An ergonomic chair and desk.

Rationale for the Lesson

This lesson helps pupils understand important safety measures when using computers. It enables them to protect their eyes and body from strain and injury, promoting healthy computer habits for their well-being and future productivity.

Prerequisite/Previous Knowledge

Pupils have basic knowledge of computer parts and have used computers for various tasks.

Lesson Content/Board Summary

SAFETY MEASURES WHEN USING COMPUTERS

1. The Sitting Posture

Good sitting posture is the way one positions their body to prevent strain or injury when sitting, especially while using a computer. Maintaining a good posture helps to avoid back pain, neck pain, and other musculoskeletal problems.

Characteristics of a good sitting posture:

Sit upright with your back supported by the chair.
Keep your feet flat on the floor or on a footrest.
Ensure your knees are at approximately a 90-degree angle.
Keep your elbows close to your body, bent at a 90-degree angle.
Relax your shoulders and keep them down.
Avoid slouching or leaning forward excessively.

2. Using the Anti-Glare Protector

An anti-glare protector is a screen that is placed over the computer monitor to reduce reflections and glare from light sources. Glare can cause eye strain, headaches, and fatigue, making it difficult to see the screen clearly.

Importance of an anti-glare protector:

Reduces eye strain caused by reflections.
Improves visual clarity and comfort.
Helps prevent headaches and fatigue associated with prolonged computer use.
Protects the monitor screen from scratches and dust.

3. Positioning of Monitor Base

The correct positioning of the monitor base is important for maintaining good posture and preventing neck and eye strain. The monitor should be placed at an optimal height and distance from the user.

Guidelines for monitor positioning:

Height: The top of the monitor screen should be at or slightly below eye level. This prevents you from tilting your head up or down too much.
Distance: The monitor should be placed at arm’s length (about 20-30 inches or 50-75 cm) from your eyes. This allows you to view the screen comfortably without straining your eyes.
Angle: The screen should be tilted slightly upwards to avoid reflections and ensure comfortable viewing.
Lighting: Position the monitor to avoid direct glare from windows or overhead lights.

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, reviews the previous lesson briefly, and then asks pupils if they have ever felt tired or had headaches after using a computer for a long time. The teacher then introduces the topic: “Safety Measures when using computers.”
Pupils’ Activity: Pupils respond to the teacher’s questions and listen attentively to the introduction of the new topic.
Learning Point: Pupils recall previous knowledge and are introduced to the lesson’s focus on computer safety.

Step 2: Explanation of Good Sitting Posture

Time: 10 minutes
Teaching Skill: Explanation/Demonstration
Teacher’s Activity: The teacher explains what a good sitting posture is and demonstrates the correct way to sit at a computer using a chart and an available chair. The teacher highlights key points like back support, feet position, and arm angles.
Pupils’ Activity: Pupils observe the demonstration, listen to the explanation, and attempt to practice the correct sitting posture at their desks.
Learning Point: Pupils understand and can demonstrate the correct sitting posture.

Step 3: Importance of Anti-Glare Protector

Time: 10 minutes
Teaching Skill: Explanation/Visual Aid
Teacher’s Activity: The teacher explains what an anti-glare protector is, its purpose, and shows a physical example if available. The teacher discusses how glare affects the eyes and how the protector helps to reduce eye strain.
Pupils’ Activity: Pupils listen to the explanation, observe the anti-glare protector, and ask questions for clarification.
Learning Point: Pupils understand the function and importance of an anti-glare protector.

Step 4: Positioning of Monitor Base

Time: 5 minutes
Teaching Skill: Demonstration/Explanation
Teacher’s Activity: The teacher explains the correct height and distance for positioning a computer monitor base. Using a computer if available, the teacher demonstrates how to adjust the monitor for optimal viewing, ensuring the top is at eye level and it’s an arm’s length away.
Pupils’ Activity: Pupils observe the demonstration and listen to the instructions on how to position a monitor correctly.
Learning Point: Pupils learn the correct way to position a computer monitor for comfortable viewing.

Step 5: Practical Demonstration and Practice

Time: 5 minutes
Teaching Skill: Guided Practice
Teacher’s Activity: The teacher guides pupils to collectively review and practice the three safety measures discussed: demonstrating good sitting posture, identifying the need for an anti-glare protector, and discussing monitor positioning. The teacher corrects any errors.
Pupils’ Activity: Pupils actively participate in the practice, demonstrating the correct postures and discussing the importance of each measure.
Learning Point: Pupils reinforce their understanding through practical application.

Step 6: Class Discussion and Question

Time: 5 minutes
Teaching Skill: Question and Answer
Teacher’s Activity: The teacher facilitates a short discussion, inviting pupils to ask any lingering questions about computer safety measures. The teacher clarifies any misconceptions.
Pupils’ Activity: Pupils ask questions and contribute to the discussion, clarifying their understanding.
Learning Point: Pupils get their questions answered and deepen their comprehension.

Step 7: Evaluation/Review

Time: 5 minutes

Teaching Skill: Questioning/Assessment

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

What is a good sitting posture?
Mention two characteristics of a good sitting posture when using a computer.
Why is an anti-glare protector important when using a computer?
Describe the correct height and distance for positioning a computer monitor.

Pupils’ Activity: Pupils answer orally and in writing.

Learning Point: Pupils demonstrate understanding of the lesson.

Step 8: Conclusion

Time: 5 minutes
Teaching Skill: Summarization
Teacher’s Activity: The teacher summarizes the key learning points of the lesson, emphasizing the importance of adopting these safety measures for health and well-being. The teacher gives an assignment: “Draw and label a diagram showing a person in a good sitting posture using a computer.”
Pupils’ Activity: Pupils listen to the summary and copy down the assignment.
Learning Point: Pupils consolidate their learning and are given tasks to reinforce it.

Lesson Keywords

Sitting posture – The way one positions their body while sitting.
Anti-glare protector – A screen placed over a monitor to reduce reflections.
Monitor base – The stand that supports a computer screen.
Ergonomics – The study of people’s efficiency in their working environment.
Eye strain – Discomfort in the eyes caused by prolonged visual tasks.

Differentiation

For pupils who grasp concepts quickly, the teacher can challenge them to research other computer safety measures (e.g., keyboard and mouse positioning). For pupils needing more support, the teacher can provide one-on-one guidance during practical demonstrations and offer simplified explanations or visual aids.

Note for teachers using this lesson plan

Encourage practical demonstrations using an actual computer setup in the classroom or computer lab. Emphasize that these safety measures are not just for school but for any time pupils use computers at home or elsewhere. Ensure pupils understand the long-term health benefits of adopting good ergonomic practices early.