Lesson plan on how we hear sounds

Textbook Edition Four Science "How We Hear Voices" Instructional Design:

1. Import. Students, let's guess a riddle first, watch **, play an idiom story, why did the person who stole the bell cover his ears and was discovered? (Can you cover everyone's ears if you can cover yourself?)

It seems that the ear is born with the function of hearing sounds, so how do we hear sounds? It all starts with the structure of the ear.

Second, the role of the auricle and tympanic membrane:

1.**Auricle:

The ear we touch with our hands is only a small part of the human ear, which is called the pinna. It is made up of wrinkled cartilage wrapped in **. Earlier we learned how sound travels.

2.**Ear canal, tympanic membrane:

What is the function of the sound wave that is collected by the ear canal (ear canal slide show) that is collected by the pinna of the ear will go deep along the ear canal? (Board book: Channel - Sound Wave Channel).

Student Debriefing Teacher's Board Book:

Loud – strong vibration; Low sound – weak vibration.

The sound is far away - the vibration is weak; The sound is close – the vibration is strong.

In the experiment, we see that Xiaomi is vibrating, but what is actually vibrating is also vibrating? What is the balloon skin simulating (tympanic membrane) (slide lamp), so what happens to the eardrum when it encounters sound waves? (Plate book tympanic membrane – causes vibrations).

Behind the eardrum there are ossicles, cochlea, and auditory nerves.

Learning objectives: 1. Know the structure of the human ear.

2. Know the propagation process of sound in the human ear.

3. Understand the "binaural effect" and analyze some related acoustic phenomena.

1. Create a scenario and stimulate interest.

Review questions: 1. How is sound produced?

2. What are the sound transmission media? Can a vacuum transmit sound?

What about the conditions? 1. There must be a sound source. 2. There should be a sound transmission medium. 3. The human ear can feel the sound.

In this lesson, we will learn how we hear sounds through the study of the human ear.

2. Teaching of new courses.

1. Show the wall chart.

2. Joint activities of teachers and students:

Sound is transmitted to the auditory nerve through the skull and jaw and then to the brain, causing the auditory sense to conduct is called bone conduction.

Beethoven was deaf in both ears in his later years, and his deafness was non-neurological deafness.

One end of the stick, the other end of the stick, is on the piano and listens to the sound of the piano you play, thus creating a large amount of music. He sensed the sound.

The way of sound is bone conduction.

Teaching Objectives: Scientific Concept: The human ear is composed of the outer ear, the middle ear and the inner ear, and the pinna of the outer ear transmits the collected sound to the eardrum through the ear canal, causing the vibration of the eardrum, and this vibration signal is transmitted to the brain, through the processing of the brain, we can hear all kinds of sounds.

Process and Method: By studying how different sounds of different sizes and distances affect the vibration of the self-made tympanic membrane model, explain the role of the eardrum of the human ear, and feel the role of the eardrum through experiential activities. Emotions, Attitudes, Values:

Make it a habit to observe and pay attention to the things around you.

Teaching Focus: The Role of the Eardrum Teaching Difficulties: Understanding how the ear hears sounds Teaching preparation: Diagram of the structure of the ear, 1 glass, balloon skin, tuning fork, fine sand.

Teaching process: 1. Introduce the sound generated by the vibration of the object to the air in the form of waves to our ears, how do we hear the sound?

2. Understand the structure and function of the ear1. Understand the structure of the ear: show a schematic diagram of the structure of the ear, explain the various parts of the ear, and guess what are the functions of the outer ear, the middle ear, and the inner ear? Focus on the important role that the eardrum plays. 2. How does the eardrum vibrate?

3. Study the role of the tympanic membrane 1. Show the tympanic membrane model, observe the vibration of the tympanic membrane, briefly introduce the production of the tympanic membrane model, and put some fine sand on the tympanic membrane model.

2. Group experiment: A student takes a tuning fork and taps in front of the tympanic membrane model to observe the different vibrations of the tympanic membrane. The test shows that when an object makes a sound, the eardrum vibrates, and when the vibration is transmitted to the brain, we can hear the sound after the brain processes it.

3. Group activities: Let students hold a tuning fork and use different forces to tap in front of the tympanic membrane model, carefully observe the difference in the vibration of the eardrum, let the students hold the tuning fork in front of the tympanic membrane model, and strike it separately, and then carefully observe the difference in the vibration of the eardrum.

4. Through experimental communication, the relationship between the vibration of the tympanic membrane and the strength of the organism and the distance of the sound it receives: the sound is strong, and the tympanic membrane vibrates strongly; weak vocalization, weak tympanic membrane vibration; The distance is close, and the eardrum vibrates violently; The distance is long, and the tympanic membrane vibrates weakly.

Fourth, the study of the role of the pinna, the tympanic membrane vibration is transmitted to the human brain, the brain is processed, so that we hear the sound, what is the function of the pinna? Can you design a test proof? Students study and communicate to draw conclusions.

5. Summary: How do we hear voices?

What is Voice" lesson plan.

1. Teaching materials. 1) Status and role.

This chapter is the first time students have been exposed to and learned physics. For physics, it is a huge time for them to get on the sedan chair, but students are no strangers to sound, and the learning methods and knowledge are relatively simple, and learning this chapter plays a pivotal role in students' future learning.

2) Teaching objectives.

This lesson consists of "Sound Production", "Sound Propagation", "Sound Energy", and "Sound Propagation Velocity.""The four-part content is composed of four parts, mainly allowing students to guess the production conditions and propagation conditions of sound from "sounds in life", and can master some necessary methods for learning physics through experimenting with the production and propagation conditions of sounds, and establish the following learning objectives according to the curriculum standards and the characteristics of the textbooks and the characteristics of the textbooks and its status and role in the textbooks, combined with the actual situation of students in the school:

1. Knowledge and skills.

Gain a preliminary understanding of the conditions under which sound is produced and propagated. Knowing that sound propagation requires a medium, and the speed at which sound propagates in different media is different. Knowing that sound has energy, echo and simple applications.

2. Process and method.

Through experiments**, we will have a preliminary understanding of the conditions under which sound is produced and propagated. Cultivate the ability to observe, the ability to preliminarily explain physical phenomena, and the ability to apply physical laws to explain physical phenomena.

3. Emotional attitudes and values.

Through the discussion and exchange of brothers and sisters in the learning process, the awareness and attitude of cooperative learning are cultivated. Through observation and comparison in experiments, students will develop a scientific attitude of seeking truth from facts, good study habits and the ability to integrate theory with practice. Learn the ability of scientists to discover problems and the valuable spirit of never giving up after discovering problems.

First of all, I review the introduction, knock on the blackboard, make a sound, and then ask a few key questions, review the old knowledge and introduce the new knowledge, how does the blackboard produce sound? Through what substance came to you? How do you receive it?

Then introduce the structure of the ear, many students will actively express their existing cognition, so let them express more, and then we will learn the structure of the ear together, I made the ear ** into three animations, there is a hierarchical presentation structure, the effect is better.

Secondly, it is the role of the ear, let the students think about its role first, many students do not know the role of the ear, the pre-concept also has such a cognition: fixed shape, better looking, etc., and then by simulating the role of the ear, everyone can summarize the role of collecting sound, and the impression is also very profound.

Finally, it is to simulate the role of the eardrum, pre-do experiments, at the beginning I used plastic wrap, magnify the phenomenon of small objects with foam balls, but the effect is not good, later improved, the use of balloon skin effect is a little better, but still not obvious enough, so later the small objects are replaced with sand or fine foam crumbs, the effect is good, but the experimental hygiene is difficult to guarantee, on this basis, and then changed, replaced with salt, the effect has reached the best of the current attempt, and the experimental effect in the classroom is also very good.