lesson 10-10 (1) English

Long-term plan section:

Basics of Thermodynamics

School:  

Date: ______________

Teacher(s):  

Класс: 10 Е

Number of attendees: ______

Absentees: ____

Lesson Topic

Mechanical properties of solids.

Learning objectives that are achieved in this lesson (link to the curriculum)

- 10.3.4.4 - determine the Young's modulus for elastic deformation;

Lesson objectives

Students will:

-          know the types of deformation, physical quantities: mechanical stress, elongation, Young's modulus; Hooke's law

-          determine the modulus of elasticity during deformation

Success criteria

Students will:

-          know the types of deformation, physical quantities: mechanical stress, elongation, Young's modulus; Hooke's law

-          determine the modulus of elasticity during deformation

Language goals

Vocabulary and terminology specific to the subject:

Elastic, plastic deformation; mechanical stress, absolute elongation, elongation, modulus of elasticity, tensile strength, stiffness coefficient

A series of useful phrases for dialogue / writing:

The accuracy of the result can be improved by ...

Risk ... was reduced by ...

Instilling values

(including key elements of the global

Citizenship (YY))

Development of effective communication skills, respect for classmates

Knowledge and understanding of GG: responsibility for their actions, collective deeds

GG values: tolerant attitude towards people around, personal responsibility for collective work.

GG skills: dialogue, constructive interaction with other people.

The imparting of values ​​is carried out through / through discussion of the key points of the topic in groups.

Inter subject

connections

Mathematics

ICT skills

Search for additional information on the Internet.

http://class-fizika.spb.ru/index.php/10-11cl/902-td8

Preliminary knowledge

Crystalline and amorphous bodies

Lesson Proper

Scheduled Lesson Stages

Scheduled Lesson Activities

Resources

Beginning

5 min.

The teacher demonstrates breaking a wooden stick and bending a metal rod. Encourages students to explain the experiment and answer questions.

What types of deformation have you observed?

What are the differences in the results of the experiment?

What do you need to know to predict these results?

After hearing the answers, the teacher suggests the topic of the lesson.

Lesson topic:

determine the Young's modulus for elastic deformation;

Theme of the lesson: Mechanical properties of solids.

Lesson objectives:

-          know the types of deformation, physical quantities: mechanical stress, elongation, Young's modulus; Hooke's law

-          determine the modulus of elasticity during deformation

Wooden stick metal rod (wire)

Middle

32 min.

The teacher suggests that students answer the following question:

- What is the meaning, in your opinion, of this topic?

Addition of the teacher: The fact is that the properties of solids and materials largely determine the level of its technical development. Solid state physics is the basis of modern materials science. Since the use of most solids is determined primarily by their mechanical properties, out of the whole variety of physical properties, we

we study exactly mechanical properties.

To study the material offers to use the site https://bilimland.kz/ru.  Enter the bilimland website - the subject of physics - the foundations of physics - mass and strength - Hooke's law. Young's modulus. Open slide 2 - 8 and find the answers to the questions:

What is the difference between plastic and elastic deformation?

What forces arise during deformation? How are they directed?

What is called absolute elongation (ΔL) and relative elongation (Ɛ)?

What is mechanical stress?

In which units will the mechanical stress be measured?

Task:

Using the definition of mechanical stress and Hooke's law, obtain the dependence of mechanical stress on the relative elongation.

Result: σ = E*Ɛ, where E = K*L0/S – modulus of elasticity, Young's modulus.

Practical work: Determination of the elastic modulus (Young's modulus) of the fishing line

Instruments and materials: tripod with foot and clutch, ruler, piece of fishing line, caliper, a set of goods, marker, electronic scales.

Theoretical justification

Young's modulus can be found on the basis of Hooke’s law. The graph of the function will be a straight line passing through the origin, the Young's modulus is the gradient in the equation of the function.

To determine the Young's modulus, it is necessary to determine the elongation, relative elongation and mechanical stress for different values ​​of the load. Build a graph of mechanical stress versus elongation. Determine its gradient.

Basic calculation formulas:

Based on these formulas, you can get the equation for the original data. Determine the equation of the function of dependence m (∆l)

Highlight the gradient in the formula.

Show how to calculate the Young's modulus from the gradient.

Procedure

Задание 1. Подготовка  установки и определение начальных характеристик лески.

1. Соберите установку как показано на рисунке.

2. Нанести на резиновом шнуре две метки на расстоянии l₀ друг от друга ( не менее 15 см) и измерьте это расстояние l₀=……см = ……… м.
3. Используя штангенциркуль, измерьте диаметр лески или резинового шнура несколько раз в разных местах.

___________________________________________________________________________________

4.  Определите средний диаметр_________________________________________________________.
5. Рассчитайте среднюю площадь поперечного сечения

___________________________________________________________________________________.

Задание 2. Измерение данных для определения Модуля Юнга.

1. Закрепите один конец шнура в лапке штатива, а ко второму подвесьте груз небольшой массы.  Запишите в таблицу значение m для данного опыта.
2. Снова измерьте расстояние между метками на шнуре. Запишите в таблицу значение l для данного опыта.
3. Повторите 3 и 4 шаги для грузов разной массы не менее 6 раз. Проверьте массы грузов с помощью электронных весов.

Каждый раз проверяйте чтобы деформация оставалась упругой!!!

4. Рассчитайте абсолютное удлинение для каждого опыта.
5.  Enter the data in Table 1.

Table 1 Data for the definition of Young's Modulus

Task 3. Plotting and gradient definition.

1. On a sheet for graphs, build a graph of the dependence of the mass on the absolute elongation.
2. Determine the gradient. Show your work. Record the value with units.
3. Using the formulas obtained in the theoretical study, calculate the value of the Young's modulus.

4.      Make a conclusion

Laptops with Internet access

https://bilimland.kz/ru

End

3 min.

Reflection:

Summing up the goal of the lesson.

- determine the types of deformation, physical quantities: mechanical stress, elongation, Young's modulus; Hooke's law

 determine the elastic modulus during deformation

Differentiation - how do you plan to provide more support? What tasks do you plan to set for more capable students?

Grading - How do you plan to check students' level of learning?

Health & Safety

I plan to support them through a general discussion of the results of work with Internet sources, suggested text questions, individual counseling.

Pairing, individual counseling

Creating a favorable psychological atmosphere, the compliance of tasks to the level of preparedness of students, the change of activities, counseling.

What tasks do you plan to set for more capable students?

Providing advice to students who have difficulty

Students will:

Most students will:

Some learners will be:

- determine the types of deformation, physical quantities: mechanical stress, elongation, Young's modulus; Hooke's law

- determine the modulus of elasticity during deformation

- interpret the gradient of the dependence of the elongation on the load as a modulus of elasticity

Lesson Refletion

Use this section to reflect on the lesson. Answer the most important questions about your lesson from the left column.

Were the objectives of the lesson / learning objectives realistic?

Have all students reached the DH?

If not, why not?

Is the differentiation correct in the lesson?

Have the lesson temporal stages been sustained?

What were the deviations from the lesson plan and why?

Overall rating

What are two aspects of the lesson that went well (think about both teaching and learning)?

1:

2:

What could contribute to improving the lesson (think about both teaching and learning)?

1:

2:

What did I find out during the lesson about the class or the achievements / difficulties of individual students, what should I look for in subsequent lessons?