### Lesson Plan: Calculation Involving Work Done
**Subject:** Basic Science and Technology
**Class:** Junior Secondary 2
**Topic:** Calculation Involving Work Done
**Duration:** 40 minutes
#### Objectives:
By the end of the lesson, students should be able to:
1. Understand the concept of work in scientific terms.
2. Identify the formula for calculating work.
3. Accurately perform calculations involving work done.
4. Relate everyday activities to the concept of work in physics.
#### Materials:
- Whiteboard and markers
- Chalkboard and chalk
- Projector (if available)
- PowerPoint slides or printed handouts
- Calculator
- Worksheets with practice problems
#### Lesson Breakdown:
### Introduction (5 minutes)
1. **Greeting and Settling Down:** Welcome students and ensure they are settled in their seats.
2. **Review of Previous Lesson:** Briefly review any related previous topics, such as force and energy, to set the context.
3. **Warm-up Question:** Ask students, “What do you think 'work' means in science?” Collect responses to gauge their initial understanding.
### Presentation (15 minutes)
1. **Definition of Work:**
- Write and explain the definition on the board.
- “In scientific terms, work is done when a force causes an object to move in the direction of the force.”
- Provide everyday examples (e.g., pushing a shopping cart, lifting a book).
2. **Formula for Work:**
- Introduce the formula: \[ \text{Work} (W) = \text{Force} (F) \times \text{Distance} (d) \]
- Define the units: Force (Newtons, N), Distance (meters, m), Work (Joules, J).
3. **Demonstrate with Examples:**
- Example 1: Calculate the work done if a force of 10 N moves an object 3 meters.
\[ W = F \times d = 10 \, \text{N} \times 3 \, \text{m} = 30 \, \text{J} \]
- Example 2: Calculate the work done if a student lifts a 5 kg book up to a shelf 2 meters high.
- First, calculate the force (weight): \( F = \text{mass} \times \text{gravity} = 5 \, \text{kg} \times 9.8 \, \text{m/s}^2 = 49 \, \text{N} \)
- Then, calculate the work: \[ W = 49 \, \text{N} \times 2 \, \text{m} = 98 \, \text{J} \]
### Guided Practice (10 minutes)
1. **Interactive Practice:**
- Provide students with different practice problems on a worksheet.
- Walk around the classroom to assist students as they work through the problems.
2. **Class Discussion:**
- Review the solutions to the practice problems together.
- Clarify any confusing points and ensure students understand how to arrive at the correct answers.
### Independent Practice (5 minutes)
1. **Worksheet:** Hand out an additional worksheet with more practice problems for students to complete individually.
### Conclusion (5 minutes)
1. **Recap:** Summarize the key points covered in the lesson.
- Definition of work.
- The formula for calculating work.
- Examples of work in everyday life.
2. **Questions and Answers:** Allow students to ask any final questions they might have.
3. **Assignment:**
- Assign students to find three everyday activities where work is done and to compute the work done, given the force and distance.
#### Assessment:
- Evaluate students based on their participation during the interactive practice.
- Check the accuracy of their independent practice worksheet.
- Review the homework assignment for understanding and accurate calculations.
#### Additional Notes:
- For students who grasp the concept quickly, introduce problems involving varying angles and the concept of components of force.
- Encourage students to think critically and provide real-life examples.
This lesson plan balances theoretical explanation, practical application, and interactive student engagement to effectively teach the topic of work done in physics to Junior Secondary 2 students.