Topicm36e87f2c1379b5c2_1528449000663_0Topic

Energy conversionenergy conversionEnergy conversion during the vibrations of the mathematical pendulummathematical pendulummathematical pendulum and the weight on the springweight on the springweight on the spring

Levelm36e87f2c1379b5c2_1528449084556_0Level

Second

Core curriculumm36e87f2c1379b5c2_1528449076687_0Core curriculum

VIII. Vibrating motion and waves. The student:

2) describes the vibrating motion (vibrations) of the body under the influence of elastic force and analyzes qualitatively conversion of kinetic energy and potential energypotential energypotential energy of elasticity in this motion; indicates the equilibrium positionequilibrium positionequilibrium position.

Timingm36e87f2c1379b5c2_1528449068082_0Timing

45 minutes

General learning objectivesm36e87f2c1379b5c2_1528449523725_0General learning objectives

Description of energy conversionenergy conversionenergy conversion occurring during harmonic vibrationsharmonic vibrationsharmonic vibrations.

Key competencesm36e87f2c1379b5c2_1528449552113_0Key competences

1. A qualitative descriptionqualitative descriptionqualitative description of the changes in the mechanical energy of the oscillator.

2. Indicates the position at which the kinetic energy reaches its maximum value.

3. Indicates the position at which the potential energy reaches its maximum value.

Operational (detailed) goalsm36e87f2c1379b5c2_1528450430307_0Operational (detailed) goals

The student:

- describes qualitatively changes in the mechanical energy of the mathematical pendulummathematical pendulummathematical pendulum and the weight on the springweight on the springweight on the spring,

- determines the kinetic energykinetic energykinetic energy and the potential energy of the mathematical pendulum and the weight on the spring.

Methodsm36e87f2c1379b5c2_1528449534267_0Methods

1. Discussion presenting new knowledge.

2. Problem lecture.

Forms of workm36e87f2c1379b5c2_1528449514617_0Forms of work

1. Work in groups on solving problem tasks.

2. Teacher‑student collaboration during discussion presenting new knowledge.

Lesson stages

Introductionm36e87f2c1379b5c2_1528450127855_0Introduction

Answer the introductory questions to the lesson. It will help to understand the course of the lesson.

1. When does the body perform harmonic vibrationsharmonic vibrationsharmonic vibrations?
2. Define the amplitude, period and frequency of vibrations.
3. Does the mechanical energy of the moving body change during vibrations?

Procedurem36e87f2c1379b5c2_1528446435040_0Procedure

The energy changes during the movement of the mathematical pendulum.
The following slides show changes in the mechanical energy of the mathematical pendulum.m36e87f2c1379b5c2_1527752256679_0The energy changes during the movement of the mathematical pendulum.
The following slides show changes in the mechanical energy of the mathematical pendulum.

[Slideshow]

Energy changes during the movement of the weight on the springweight on the springweight on the spring.

The following slides show the changes in the mechanical energy of the weight on the springspringspring.

[Illustration 1]

Slide descriptions:

[Table 1]

Lesson summarym36e87f2c1379b5c2_1528450119332_0Lesson summary

Summary:

1. During the vibrations of the harmonic oscillator, there are continuous changes of kinetic energy into potential energy and vice versa.

2. If any resistance forces are working during the vibrations of the body, its mechanical energy is preserved.

3. If the resistance forces act on the body during the vibrations, its mechanical energy decreases in time. Part of the mechanical energy dissipates and change into heat.

Selected words and expressions used in the lesson plan

mathematical pendulummathematical pendulummathematical pendulum

weight on the springweight on the springweight on the spring

kinetic energykinetic energykinetic energy

potential energypotential energypotential energy

energy conversionenergy conversionenergy conversion

equilibrium positionequilibrium positionequilibrium position

springspringspring

qualitative descriptionqualitative descriptionqualitative description

harmonic vibrationsharmonic vibrationsharmonic vibrations

resistance forcesresistance forcesresistance forces