Lesson Plan | Technical Methodology | Statics: Torque or Moment

Objectives

Duration: 10 - 15 minutes

The purpose of this lesson plan stage is to introduce students to the concept of torque and its practical application, preparing them for experimental activities and challenges that simulate real job market situations. By focusing on understanding and calculating torque, students will develop essential analytical and practical skills for various technical and industrial fields.

Main Objectives

1. Understand that the torque of a force is a measure of the tendency to rotate a given body.

2. Calculate the torque using the formula: τ = F x d x sin α.

Side Objectives

1. Recognize the importance of torque in different everyday contexts and industrial applications.
2. Develop critical thinking and problem-solving skills through the application of torque formula in various situations.

Introduction

Duration: 10 - 15 minutes

The purpose of this lesson plan stage is to introduce students to the concept of torque and its practical application, preparing them for experimental activities and challenges that simulate real job market situations. By focusing on understanding and calculating torque, students will develop essential analytical and practical skills for various technical and industrial fields.

Contextualization

Imagine trying to open a door by pushing it near the hinges. Certainly, it would be much more difficult than pushing it at the opposite end. This everyday situation illustrates the concept of torque, which is fundamental to understanding how forces cause rotations. Torque is the measure of a force's tendency to make an object rotate about an axis. This concept is widely applicable in various fields, from civil construction to mechanical engineering and product design.

Curiosities and Market Connection

Torque is a crucial physical quantity in many industries. For example, in automotive engineering, understanding torque is essential for designing efficient engines and transmission systems. In robotics, torque determines the ability of motors to move parts of the robot accurately. In civil construction, torque is considered in the design of structures to ensure stability and safety. Furthermore, in sports like golf and baseball, the torque applied by the athlete during the swing can define the success of the hit.

Initial Activity

To spark students' interest, show a short video (2-3 minutes) demonstrating the application of torque in different scenarios, such as opening doors, using a wrench to tighten bolts on a car, and the operation of electric motors. After the video, ask the following provocative question: 'Why do you think it is easier to open a door by pushing at the end rather than near the hinges?'

Development

Duration: 55 - 70 minutes

The purpose of this lesson plan stage is to provide students with a practical and in-depth understanding of the concept of torque. Through practical activities and fixation exercises, students will be able to apply the theory learned in real situations, developing analytical and problem-solving skills that are essential for the job market and various technical fields.

Covered Topics

1. Definition of Torque
2. Torque Formula: τ = F x d x sin α
3. Units of Measurement for Torque
4. Practical Applications of Torque
5. Importance of Torque in Engineering and Other Industries

Reflections on the Theme

Guide students to reflect on how the concept of torque applies to everyday situations and in the industry. Ask how they noticed the importance of torque in the objects and machines they use daily and what the impact would be of not considering torque in engineering projects, such as in the construction of bridges or the design of vehicles.

Mini Challenge

Building a Torque Balance

In this practical activity, students will build a torque balance using simple materials like a ruler, string, and weights. The activity aims to illustrate how torque acts in a balanced system.

Instructions

1. Divide the students into groups of 3 to 4 people.
2. Distribute the necessary materials: a 30 cm ruler, string, weights of different masses, and a support (like a cardboard box) to hang the ruler.
3. Instruct the students to tie a piece of string to the center of the ruler and hang it on the support so that the ruler can rotate freely.
4. Ask the students to position the weights at different distances from the center of the ruler and observe how the balance behaves.
5. Guide the students to note their observations and calculate the torque at different points using the formula τ = F x d x sin α.
6. Suggest that students experiment to balance the ruler by placing different weights on opposite sides, adjusting the distances to achieve balance.

Objective: Demonstrate practically how torque influences the balance of a system and how different forces and distances affect the moment of a force.

Duration: 30 - 40 minutes

Evaluation Exercises

1. Calculate the torque produced by a force of 10 N applied at 0.5 meters from the axis of rotation, forming an angle of 90° with the lever.
2. A mechanic applies a force of 150 N on a 30 cm long wrench to tighten a nut. What is the torque applied?
3. Explain why it is easier to turn a larger wrench than a smaller wrench when tightening a screw.
4. Given a balanced system, with a weight of 20 N placed 0.4 meters from the axis of rotation on one side, what force should be applied at 0.2 meters on the other side to maintain balance?

Conclusion

Duration: 10 - 15 minutes

The purpose of this lesson plan stage is to consolidate students' learning, ensuring that they understand the importance and practical application of the concept of torque. Through a recap of the main points, reflective discussion, and contextual closure, students will have a complete and integrated view of the topic, strengthening their analytical and practical skills.

Discussion

Guide students to reflect on the practical applications of torque that were explored during the lesson. Ask them how the exercises and the mini challenge helped consolidate their understanding of the concept of torque. Promote a discussion about how the knowledge gained can be applied in everyday situations and in job market contexts, such as in engineering, mechanics, and other technical fields.

Summary

Recap the main points covered in the lesson: the definition of torque, the formula τ = F x d x sin α, the units of measurement, and the various practical applications of torque in industry and everyday life. Reinforce the importance of understanding how torque acts in different systems and how to calculate it accurately.

Closing

Close the lesson by highlighting the relevance of the concept of torque for everyday life and various professions. Explain that understanding torque is essential for designing and building efficient and safe systems. Encourage students to continue exploring the topic and think about other situations where torque can be a determining factor.