Lesson Plan | Active Learning | Work: Weight

Assumptions: This Active Lesson Plan assumes: a 100-minute class, prior student study with both the Book and the start of Project development, and that only one activity (among the three suggested) will be chosen to be conducted during the class, as each activity is designed to take up a significant portion of the available time.

Objectives

Duration: (5 - 10 minutes)

The objective-setting phase serves to clearly establish what students should be able to do by the end of the lesson, focusing on the key competencies necessary to understand and apply the concept of work by the weight force. This approach guides both the teaching and learning processes, ensuring that all efforts are aligned with specific and measurable goals.

Main Objectives:

1. Empower students to calculate the work done by the weight force using the formula τ = mgh, where 'm' is the mass of the object, 'g' is the acceleration due to gravity, and 'h' is the change in height.

2. Develop abilities to apply physical concepts in practical situations through examples and exercises involving the calculation of work in real and hypothetical contexts.

Side Objectives:

1. Encourage critical thinking and problem-solving through the analysis of complex situations involving the calculation of work by the weight force.

Introduction

Duration: (15 - 20 minutes)

The introduction serves to engage students with situations that stimulate the practical application of the concept of work by the weight force, using problems based on real and everyday contexts. Additionally, the contextualization seeks to connect the topic with the real world, increasing interest and relevance of the study for students, showing that what they are learning has direct and significant applications in their lives and future careers.

Problem-Based Situations

1. Imagine an elevator transporting a load of 500 kg from the ground floor to the 10th floor, which is 45 meters high. If the acceleration due to gravity is approximately 9.8 m/s², how can we calculate the work done by the weight force during this operation?

2. Consider a climber carrying a backpack weighing 15 kg and climbing a mountain that is 2000 meters high. The acceleration due to gravity at that location is approximately 9.8 m/s². What is the total work done against the weight force to reach the summit?

Contextualization

The concept of work by the weight force is essential not only in physics but also in various practical day-to-day situations, such as transporting loads, construction, and even in sports activities. Knowing how to calculate and understand the impact of the weight force is crucial for engineers, architects, and even for those who practice mountain sports. Additionally, curiosities such as the fact that the work done by the weight force is independent of the path, only depending on the change in height, add a layer of fascination and relevance to the topic.

Development

Duration: (65 - 75 minutes)

The development phase is designed to allow students to apply the concept of work by the weight force practically and contextually using a flipped classroom methodology. By working in groups to solve complex problems in situations that simulate real challenges, students develop calculation, critical analysis, and communication skills. This approach not only reinforces theoretical learning but also promotes teamwork and problem-solving, preparing students for real situations and future professions where understanding physics is necessary.

Activity Suggestions

It is recommended to carry out only one of the suggested activities

Activity 1 - Gravitational Mission: The Rescue of Astronauts

> Duration: (60 - 70 minutes)

- Objective: Apply the concept of work by the weight force in a realistic and complex scenario, developing calculation and presentation skills.

- Description: Students are assigned to a simulated mission where they must rescue astronauts from a space station in low Earth orbit. The station is failing, and the astronauts need to be brought back to Earth. Each group receives data such as the mass of the astronauts, the height of the orbit, and gravitational acceleration, and must calculate the work needed to bring the astronauts back, considering atmospheric resistance and the change in height.

- Instructions:

• Divide the class into groups of up to 5 students.

• Distribute the mission data to each group.

• Guide students to calculate the work done by the weight force to bring the astronauts back, considering height variations during reentry.

• Ask them to prepare a presentation explaining the calculation process and the results obtained.

• Hold a class discussion about the different approaches and results from the groups.

Activity 2 - Engineers' Challenge: Efficient Elevators

> Duration: (60 - 70 minutes)

- Objective: Develop skills to apply physical concepts in engineering and architecture, promoting teamwork and resolving complex problems.

- Description: In this scenario, students are challenged to design an elevator system for a 100-story building while considering energy efficiency and safety. They need to calculate the work done by the weight force when moving the elevators under different load conditions and travel distances.

- Instructions:

• Form groups of up to 5 students.

• Present the challenge of designing an efficient and safe elevator system.

• Provide data such as local gravity, average mass of people, and building height.

• Guide students to calculate the work done by the weight force for different elevator usage scenarios.

• Ask each group to present their design and calculations.

Activity 3 - Physics Olympics: Pole Vault

> Duration: (60 - 70 minutes)

- Objective: Use the concept of work by the weight force to understand and analyze sports performance, promoting the practical application of physics in a sports context.

- Description: Students will participate in a simulated pole vault competition, where they must calculate the work done by the weight force for different athletes, considering their masses, heights, and jump techniques. The goal is to determine which athlete does the most work in a specific jump and discuss the practical implications of these calculations on the athlete's performance.

- Instructions:

• Divide the class into groups of up to 5 students.

• Explain the rules and evaluation criteria for the pole vault competition.

• Distribute fictional data about athletes, including masses, heights, and jump performance.

• Guide students to calculate the work done by the weight force for each athlete and compare the results.

• Hold the competition and a final discussion about the calculations and athletes' performances.

Feedback

Duration: (15 - 20 minutes)

The purpose of this stage is to consolidate learning, allowing students to articulate and reflect on what they learned during the practical activities. The discussion helps clarify doubts, share different approaches, and reinforce the understanding of the concept of work by the weight force. Additionally, this stage promotes communication and critical thinking skills, essential for applying physical knowledge in varied contexts.

Group Discussion

After completing the practical activities, organize a large group discussion with all students. Start the discussion with a brief introduction, highlighting the importance of sharing discoveries and strategies among groups. Use some guiding questions to initiate the dialogue, such as 'What were the biggest challenges faced when calculating the work done by the weight force in the activities?' or 'How would you apply what you learned about work done by the weight force in everyday situations?'. Encourage each group to briefly present their findings and conclusions.

Key Questions

1. What are the main differences between calculating the work done by the weight force in theoretical situations and in practical situations like the ones we simulated?

2. How does the change in height influence the work done by the weight force in the different contexts we explored in the activities?

3. Were there any surprises or unexpected discoveries while performing calculations or simulations? How does this change your understanding of the concept?

Conclusion

Duration: (5 - 10 minutes)

The purpose of the Conclusion stage is to ensure that students have a clear and consolidated view of the content learned, as well as to understand the applicability of the concepts in real situations. This recap helps reinforce learning and prepare students to use these skills in future contexts, while the discussion on the interconnection between theory and practice aims to deepen students' understanding and engagement with the content.

Summary

In the conclusion, the teacher should summarize the key points discussed about the Work by the Weight Force, reinforcing the formula τ = mgh and how it is applied to calculate work in various situations. It is essential to recap the practical examples used during the lesson, such as the rescue of astronauts and the elevator project, to ensure that students have a clear and consolidated understanding of the topic.

Theory Connection

Explain how today’s lesson connected theory to practice, highlighting how the calculations and simulations performed reflect real and everyday situations. Show how applying the concept of work by the weight force in practical activities, such as the rescue of astronauts and elevator design, illustrates the relevance of physics in the real world and in the students' future careers.

Closing

Finally, highlight the importance of studying Work by the Weight Force, explaining how this concept is fundamental to various fields, from engineering and architecture to sports and everyday life. Emphasize how understanding these physical principles can help students solve complex problems and innovate in their future professions.