Sound can travel upwards

Can the wobble also move in other fabrics?

Topic of the 3rd double lesson: Can the wobbling also wander in other fabrics?

chapter

  • _Lesson talk / teacher demonstration
  • _Transition / teacher instruction
  • _Group work- experimentation
  • _Pupil demonstration / class discussion

First lesson on sound:

Sound - what is it? (Class 4)

Description of the third double period

At the beginning of the double period, the previous course of the lesson series is repeated, in which the pupils first wrote down various noises that they heard in school on a noise map. Then they thought about the working methods of researchers and repeated the research procedure in the form of a “research group”. Based on their observations, the pupils collected questions on the subject of “sound” (“When can we hear what?” Or “What is sound?”, “How can we stop a noise?”, “How do loud / quiet sounds arise? "," How do low / high notes arise? "), Which you clarify on the basis of what you have worked out. This introduction is followed by a demonstration experiment in which the transmission of sound in the air using two glasses is discussed, with a thin metal rod on one glass. From this attempt the question of the present hour is derived. The pupils should investigate whether sound can also be transmitted in substances other than air. This is followed by group work based on the division of labor on the propagation or transmission of sound, in which the pupils five attempts (1. "The spoon bell", 2. "Tuning fork on the elbow", 3. "The cord telephone", 4. "The miracle table", 5 . "Stair railing telephone"). After this development phase, the pupils' observations and attempts at explanation are discussed: In a joint conversation it is concluded that sound can be transmitted through various substances and materials (cord, metal, bones, skin, wood). The tone sounds different depending on how it is generated and transmitted. In addition, an experiment that a student developed independently is demonstrated. To do this, he puts a ringing alarm clock in a plastic box and closes it. Then he pumps the air out of the container with a vacuum pump. The more air he sucks out, the quieter the alarm clock will ring. This experiment shows the pupils that sound needs some medium for transmission. If this medium (in this example the air) is removed, the sound is no longer transmitted and the noise can no longer be heard. At the end, the teacher gives an outlook on the next lesson, in which the functionality of the ear will be discussed and various musical instruments will be examined.

Tags

Type of video
U · Educational film
perspective
KL class
Lesson topics
TH6 sound
Grade level
KS4 class 4
Focus of analysis
KF · Class leadership

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