Lesson Plan Teknis | Work: Elastic Force

Objective

Duration: (10 - 15 minutes)

This stage aims to introduce students to the essential concepts of work and elastic force as outlined by Hooke's Law. Grasping these concepts is vital not only for moving forward in Physics but also for practical applications in various job sectors such as engineering, construction, and product design. By honing these skills, students will be better equipped to tackle real-world challenges and innovate in their future careers.

Objective Utama:

1. Comprehend that the work done by an elastic force is based on Hooke's Law.

2. Calculate the work performed by the elastic force using the formula W=(1/2)kx².

Objective Sampingan:

1. Connect the ideas of elastic force and work to real-world applications in the job market.
2. Cultivate hands-on and experimental skills with elastic materials.

Introduction

Duration: (10 - 15 minutes)

This stage aims to establish a foundation for students on work and elastic force based on Hooke’s Law. Understanding these ideas is essential not just for advancing in Physics but also for practical applications across diverse job sectors like engineering, construction, and product design. By developing these competencies, students will be better prepared to resolve issues and foster innovation in their future professions.

Curiosities and Market Connection

Springs are key components in vehicles, helping to absorb bumps and ensure a smooth ride. In civil engineering, flexible materials are used to create structures that can endure seismic forces. In medicine, devices like pacemakers employ principles of elastic force to function correctly. Product design firms utilize Hooke's Law to craft ergonomic, durable items.

Contextualization

Historically, understanding forces and movements has enabled remarkable achievements. A classic example is the use of bows and arrows, where elastic force is crucial to how bows operate. The energy harnessed in the bowstring, when drawn back, converts to work to propel the arrow, aiding in hunts and conflicts of the past. Today, elastic force remains vital, from spring designs in vehicles to building earthquake-resistant structures.

Initial Activity

Create a brief 3-minute video highlighting the use of elastic forces in various contexts, like trampolines, automobiles, and toys. Then, pose the thought-provoking question: 'How might the science behind these applications impact your future career paths?'

Development

Duration: (40 - 50 minutes)

The goal of this stage is to deepen students' comprehension of elastic force and the associated work by actively applying Hooke's Law. Through engaging hands-on activities and fixation exercises, students will cultivate essential analytical and technical skills relevant to their future careers, particularly in fields like engineering, architecture, and design.

Topics

1. Hooke's Law

2. Elastic Force

3. Work Done by an Elastic Force

4. Formula W=(1/2)kx²

Thoughts on the Subject

Facilitate a conversation on how the comprehension of elastic force and Hooke's Law can be implemented in various careers. For instance, ask students how an automotive engineer might leverage these concepts to enhance vehicle suspension or how an architect could design buildings to be more earthquake-resistant. Encourage them to consider other professions and how these physical theories could be beneficial in their future roles.

Mini Challenge

Constructing an Elastic Force Measurement Device

Students will create a simple tool to measure elastic force using everyday materials such as rubber bands, a ruler, and small weights. This hands-on experience will help students visualize Hooke's Law in practice and determine the work done by the elastic force.

1. Divide students into groups of 3-4.

2. Distribute the required materials to each group: rubber bands, ruler, small weights (like pennies), paper, and a pen for notes.

3. Guide students to attach one end of the rubber band to one end of the ruler.

4. Have students hang a weight on the opposite end of the rubber band and measure how much it stretches using the ruler.

5. Encourage students to document the initial and final stretch of the rubber band.

6. Instruct students to repeat the experiment with additional weights and record the new stretches.

7. Explain that, based on their measurements, students should determine the elastic constant (k) of the rubber band.

8. Finally, students should use the formula W=(1/2)kx² to figure out the work done by the elastic force in each situation.

Enable students to apply Hooke's Law practically, understand the connection between elastic force and work, and develop their measurement and calculation skills.

**Duration: (25 - 30 minutes)

Evaluation Exercises

1. Calculate the elastic constant (k) of a rubber band that elongates 5 cm when a weight of 10 N is applied.

2. Use the formula W=(1/2)kx² to work out the work performed by a rubber band with an elastic constant of 200 N/m when stretched by 0.1 m.

3. Discuss how Hooke's Law could be utilized in designing a toy like a Slinky.

Conclusion

Duration: (10 - 15 minutes)

This stage aims to reinforce the knowledge students have gained, encouraging reflection on the real-world application of concepts covered. By fostering discussion and summarizing main points, students can better internalize the content and appreciate the relevance of elastic force and Hooke's Law in their academic pursuits and future professions.

Discussion

Encourage an interactive dialogue with students about the concepts covered. Inquire how they felt during the hands-on activity and what challenges they faced. Motivate them to reflect on how the theory of elastic force could be relevant in their future careers and daily lives. Discuss how comprehending Hooke's Law and calculating work done by elastic force can be advantageous across various professions, including engineering, architecture, product design, and medicine.

Summary

Summarize the key points discussed during the lesson: Hooke's Law, the definition of elastic force, the formula W=(1/2)kx² for calculating work done by an elastic force, and the practical uses of these concepts. Stress the significance of understanding these physical principles for both academic growth and addressing real-world challenges in their careers.

Closing

Clarify how the lesson intertwined theory, practice, and application of elastic force concepts. Highlight the necessity of linking theoretical knowledge with practical implementations in a variety of professional settings. Conclude by underscoring that the ability to calculate work done by an elastic force is a valuable skill applicable across many fields and in everyday situations, such as creating ergonomic products, constructing safe structures, and developing effective medical devices.