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Subject: General Science
Semester: 1
Period: 3
Week: 15
School Name:
Teacher’s Name:
Subject: General Science
Grade Level: Grade 3
Date: Week 15
Lesson Duration: 45 minutes
Week & Period: Week 15, Period 3
Topic: Work
Sub-topic: Concept of Work and How It Is Done
Learning Objectives
By the end of the lesson, students should be able to:
Learners will explain the difference between work and power (rate of doing work).
Learners will give examples of work done in daily life and relate it to energy used.
Previous Knowledge
Students already know:
Objects move when pushed or pulled. Energy is needed to do tasks.
Instructional Materials
Objects for demonstrations (books, rope, spring balance), worksheets, chart showing work and power examples.
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Ask learners to lift or push objects and describe what they feel. Discuss whether moving objects is easy or hard and why.
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
Learners’ Activities (Expanded):
- Learners observe demonstrations of work being done, such as lifting a book, pushing a chair, or pulling a cart.
- Students calculate or discuss the effort needed for each activity, considering the force applied and the distance moved.
- Learners differentiate between work and power by discussing situations where the same work is done faster or harder:
- Lifting a bag slowly versus quickly
- Running up stairs versus walking
- Filling buckets one at a time versus using two buckets
- Optional activity: learners measure how long it takes to do a task (lifting or moving objects) and discuss which requires more power.
- Learners relate work to energy, discussing how energy from muscles, food, or machines is needed to perform work.
Assessment Checks (Expanded):
- Ask learners to explain one example of work done in daily life, such as carrying groceries, pushing a swing, or watering plants.
- Ask learners to identify when more power is used during work, e.g., lifting objects faster or over longer distances.
- Observe participation during demonstrations and discussions to ensure learners understand the link between work, force, distance, and power.
Notes (Expanded & Detailed):
- Work is done when a force moves an object over a distance. If the object does not move, no work is done.
- Power is the rate of doing work – how quickly or efficiently work is performed.
- Examples of work include: lifting a book, pushing a swing, pulling a cart, carrying water.
- More power is used when work is done faster or with greater effort, e.g., running upstairs versus walking.
- Relating work to energy: muscles, food, and machines provide the energy needed to perform work.
- Encourage learners to observe work and power in daily life, such as chores, sports, and transportation, to reinforce understanding.
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary:
Recap the concept of work, difference from power, and examples in daily life. Reinforce the connection between work and energy.
Evaluation Method (Expanded)
Exit slip/quiz: Learners give one example of work and explain if it requires more or less power.
Teacher will collect slips and provide oral feedback.
Assignment (Expanded)
Observe one activity at home where work is done and explain the type of force and energy involved.
Follow-up Activity
Conduct a class experiment measuring work done using simple objects (books or ropes) and discuss energy used.
Differentiation / Inclusive Strategies
Provide simplified demonstrations for learners with limited strength or mobility. Pair learners for hands-on activities. Use clear visual aids for learners who need extra support.
Teacher’s Reflection (After Class)
What worked well? ___________________________________________
What needs improvement? ____________________________________
Students’ engagement level: ☑ High ☑ Medium ☑ Low