Objectives (5-7 minutes)

1. Understand the concept of levers: The teacher should make sure that students understand the basic concept of levers, including how they work and the main components of a lever.

2. Identify the types of levers and their characteristics: Students should be able to identify the three types of levers (first-class, second-class, and third-class) and describe the characteristics of each, including the relative position of the force, the fulcrum, and the resistance.

3. Solve problems involving levers: Students should be able to apply the concept of levers to solve practical problems. This could include determining the force required to balance a lever, identifying the type of lever in a given situation, or determining the effect of changing the position of the force, fulcrum, or resistance.

   • Secondary Objective: To help students develop their critical thinking and problem-solving skills by encouraging them to apply their theoretical knowledge of levers to practical situations.

The instructor should clearly explain these objectives at the beginning of class so that students know what is expected of them and can focus on learning the relevant concepts and skills.

Introduction (10-15 minutes)

1. Review of related content: The teacher should begin the lesson by reviewing the concepts of force, fulcrum, and resistance, which are fundamental to understanding levers. This review can be done quickly, through questions and answers with students, or through simple, practical examples that illustrate these concepts.

2. Problem situation 1: "The weight of the classroom": The teacher could ask students to imagine that the classroom is a large lever, with the fulcrum in the center. The challenge would be to determine where each student should stand so that the classroom is balanced. This problem situation serves to introduce the concept of levers and spark students' interest in the topic.

3. Contextualization: The teacher should explain that levers are simple machines that are present in various everyday equipment and objects, from scissors to a seesaw. Furthermore, the principle of levers is widely used in various areas, such as engineering, architecture, medicine, among others.

4. Fun fact 1: "What is the lever of the world?": The teacher can tell students that the lever is a very old invention and that one of the first references to it in history was made by Archimedes, a famous Greek mathematician and physicist. Archimedes is said to have said: "Give me a fulcrum, and I shall move the world". This quote illustrates the power of levers and the importance they have in our lives.

5. Fun fact 2: "The world's largest lever": The instructor can show students an image of the Big Carl crane, the world's largest crane, which is essentially a giant lever. The crane is capable of lifting loads of up to 5,000 tons using the principle of levers. This fun fact serves to illustrate the practical application and importance of levers.

At the end of the Introduction, students should be familiar with the concept of levers, motivated to learn more about the subject, and aware of the presence and importance of levers in the world around them.

Development (20-25 minutes)

1. Theory - Definition and Types of Levers (10-12 minutes)

   1.1. Definition: The teacher should begin by explaining that a lever is a simple machine consisting of a rigid bar that can rotate about a fixed point, called a fulcrum. The force is applied at one point on the bar (effort arm), and the resistance is applied at another point on the bar (load arm).

   1.2. Types of Levers: The teacher should then introduce the three types of levers: first-class, second-class, and third-class levers. For each type, the teacher should explain the relative position of the force, the fulcrum, and the resistance.

2. Theory - Calculations with Levers (5-7 minutes)

   2.1. Calculating the force required: The teacher should explain how to calculate the force required to balance a lever. This calculation involves multiplying the resistance by the resistance arm and dividing the result by the effort arm.

   2.2. Calculating the distance required: The teacher should then explain how to calculate the distance required to balance a lever. This calculation involves multiplying the force by the effort arm and dividing the result by the resistance.

3. Practice - Application Exercises (5-6 minutes)

   3.1. Force and Distance Calculation Exercises: The teacher should then provide students with some practical exercises that involve calculating the force and distance in levers. Students should be encouraged to solve these exercises in groups, which will foster collaboration and discussion among them.

   3.2. Lever Type Identification Exercises: The teacher should also provide students with some exercises that involve identifying the type of lever in a given situation. These exercises will help students apply the theoretical knowledge they have acquired about the types of levers.

By the end of the Development, students should be able to identify the types of levers, understand how they work, and be able to solve practical problems involving levers.

Feedback (8-10 minutes)

1. Review of Theory and Practice (3-4 minutes)

   1.1. The teacher should go over the main points of the lesson, reviewing the definition of levers, the different types (first-class, second-class, and third-class) and how to calculate the force and distance required to balance a lever.

   1.2. Next, the teacher should review the practical exercises performed, highlighting the resolution strategies and the results obtained.

2. Connection to the Real World (2-3 minutes)

   2.1. The teacher should ask students to relate what they have learned to real-world examples. For example, how the principle of levers is applied in everyday objects, such as scissors, a wheelbarrow, or even in more complex machines, such as a crane.

   2.2. The teacher can ask students to reflect on how understanding levers can be useful in their daily lives. For example, by understanding how levers work, students may be able to solve practical problems, such as adjusting the height of a bicycle seat, or understanding how a system of levers can be used to lift heavy objects with less effort.

3. Individual Reflection (2-3 minutes)

   3.1. The teacher should ask students to reflect individually on what they have learned in the lesson. To do this, the teacher can ask the following questions:

   1. What was the most important concept you learned today?
   2. What questions have not yet been answered?

   3.2. Students should be encouraged to write down their answers, which can be shared with the class, if they wish.

By the end of the Feedback, students should have consolidated their knowledge about levers, understand the practical application of this concept, and be able to reflect on how this knowledge can be useful in their lives.

Conclusion (5-7 minutes)

1. Summary of the Content (2-3 minutes)

   1.1. The teacher should summarize the main points covered in the lesson, reviewing the concept of levers, the three types (first-class, second-class, and third-class), and the calculations involved in solving problems with levers.

   1.2. The instructor should emphasize the importance of understanding the theoretical concepts before trying to apply them in practical exercises. In addition, the teacher should reinforce the idea that constant practice is fundamental to mastery of the subject.

2. Connection between Theory, Practice, and Applications (1-2 minutes)

   2.1. The teacher should explain how the lesson connected theory, practice, and applications. For example, the theory presented on the types of levers and the calculations involved was reinforced through the practical exercises, and the applications of levers in the real world were discussed to help students understand the relevance of what they were learning.

   2.2. The teacher should also emphasize that the ability to solve problems with levers is not only useful in physics, but also in many other areas of life, such as engineering, architecture, and medicine, among others.

3. Supplementary Materials (1 minute)

   3.1. The teacher should suggest some additional study materials for students who wish to deepen their knowledge of levers. These materials could include physics books, educational videos online, interactive learning games, among others.

4. Importance of the Subject for Everyday Life (1-2 minutes)

   4.1. To conclude the lesson, the teacher should highlight the relevance of the subject to students' everyday lives. The teacher can explain that, even if we don't realize it, levers are present in many situations in our daily lives, making many tasks easier.

   4.2. The teacher can give concrete examples, such as the use of levers in gardening tools, exercise machines, or even in the way we use our bodies to lift heavy objects. In this way, students will be able to relate what they have learned in class to their own experiences and observations, which will reinforce their learning.

By the end of the lesson, students should have consolidated their knowledge about levers, understood the importance of this concept for solving practical problems and for various areas of knowledge, and be motivated to continue exploring the subject.