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Science · B7

Term 3 · Week 5 · 1.00 credits · GHS 0.50

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Lesson Note - Science

Ntwentwena M/A Basic

Weekly Lesson Plan

JHS 1 (B7) · Term 3

Science

Lesson 1 of 1

Week Ending

Friday, 22 May 2026 Backdated

Week & Term

Week 5 · Term 3

Class Teacher

Appiagyei Anthony

Subject

Science

Class

JHS 1 (B7)

Class Size

Duration

45 mins

Week No.

Week 5

Content Standard & Indicator

B7.4.4.2.3

Content Standard

Recognise some simple machines, and show understanding of their efficiency in doing work. 1. Discuss what magnets are and describe the types of magnets that

Indicator

Know work input, and output and efficiency as they apply to machines.

Performance Indicator

Learners will explain the terms work input, work output, and efficiency in simple machines using real-world Ghanaian examples.

Core Competencies

Key Words

Teaching / Learning Resources (TLR)

References

Lesson Activities by Day

Date	Phase 1: Starter (7 mins) Preparing the brain	Phase 2: Main (15 mins) New learning + assessment	Resources	Phase 3: Plenary (5 mins) Reflection + exercise
Tue 19 May 2026	1Identify examples of work being done in everyday Ghanaian settings 2Show a picture of a trader lifting a crate of tomatoes at Makola Market; ask: What is the trader doing? What force is being used?	UNDERSTANDING WORK INPUT, WORK OUTPUT, AND EFFICIENCY 1Using the Textbook and Chart/diagram, define: work input is the effort force applied (energy you put in); work output is the useful work done (result you get); efficiency is how much output you get from your input. Write all three terms on the board 2Demonstrate with a simple pulley from the Science kit: pull down on one end (work input) to lift a bucket (work output). Ask: Did we get useful work? Yes — that is efficiency in action 3Learners use their Exercise books to copy the three definitions and draw a labelled diagram of the pulley showing input force and output force	1Textbook 2Science kit (pulley, bucket, weight) 3Chart/diagram showing simple machines 4Exercise book	1Invite a confident learner to explain in one sentence: What is work output using the pulley example? 2Pairs compare their diagrams and tell each other one difference they spot between work input and work output Exercise 1A farmer (Kwame) uses a lever to lift a heavy log. The log moves 1 metre. Write: Is this work input or work output? Explain your answer in one sentence in their exercise books.
Fri 22 May 2026	1Recall the definition of work and identify examples of simple machines from daily life in Ghana 2Ask learners: What happens when Kwame uses a lever to lift a bucket of water from a well? Write three words on the board that describe what happens	UNDERSTANDING WORK INPUT, WORK OUTPUT, AND EFFICIENCY 1Use the science kit with a pulley system. Demonstrate lifting a 1 kg mass directly (work input). Then lift the same mass using the pulley (work output). Ask: Why does the pulley make this easier? Write the definition on the board: Work Input = effort applied; Work Output = useful work done; Efficiency = (Work Output ÷ Work Input) × 100% 2Learners open their exercise books and copy three labelled diagrams from the chart showing a lever, pulley, and inclined plane. Label which is work input and which is work output in each 3Solve one worked example using the textbook: A farmer uses an inclined plane ramp to load yams onto a cart. If pushing the yams up the ramp (work input) is 80 J and the yams move up 60 J of distance (work output), calculate the efficiency. Learners solve this in their exercise books	1Textbook 2Science kit with pulley system 3Chart showing simple machines with work input and output labels 4Exercise book	1A volunteer comes to the board and writes one real example of a simple machine used at Makola Market; the class identifies whether it saves work input or work output 2Learners whisper to their partner one reason why no simple machine can ever be 100% efficient Exercise 1A mason uses a lever to move a concrete block. If the work input is 200 J and the work output is 160 J, calculate the efficiency of the lever. Show your working in their exercise books.

Class Teacher

Appiagyei Anthony

Head Teacher

Signature & Date

SISO / Circuit Supervisor

Signature & Date

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