# Why does the circular saw’s sound pitch decrease

## § 35. Pitch and timbre

In the experiment in Fig. 70 we have a ruler clamped in a vise, and it makes a sound when it vibrates. When we move the ruler in a vise so that its oscillating piece is smaller, we notice that when the shorter part of the ruler oscillates, the sound it produces becomes higher and the frequency of oscillation increases. From this experience, we can conclude that as the frequency of oscillation increases, the pitch of the sound increases.

What was the purpose of the experiment shown in Figure 75? Describe how this experiment was performed and what was the conclusion reached.

In the experiment in Fig. 75 When a cardboard plate comes into contact with the rotating toothed disk, a sound is heard as a result of the plate’s oscillation. As the speed of rotation of the toothed disc increases, the frequency of oscillation increases and the pitch of the sound increases accordingly.

How can we find out by experiment that the one with the higher natural frequency of the two tuning forks produces the higher sound?? (The frequencies are not labeled on the tuning forks.).

### Skill saw circular saw bearing replacement

The higher sounding chamberton on the smoked plate will leave a more frequent trace, i.e.е. oscillates at a higher frequency (see “Tone of Hope” on page 71). Fig. 76)

The pitch of the sound depends on the oscillation frequency.

What is called a pure tone??

A pure tone is the sound of source that vibrates at the same frequency.

What are the fundamental tone and overtones of sound?

Basic tone. The frequency component of a complex sound with the lowest (smallest) frequency of vibration. Overtones. The sum of the frequency components of a sound without a fundamental tone. The frequencies of the overtones are multiples of the frequency of the fundamental tone.

How is pitch determined??

The pitch of a sound is determined by the pitch of the fundamental tone.

What is pitch and how is it determined??

Timbre of sound. The overtone coloring of a sound; a specific characteristic of musical sound. The timbre of a sound is determined by the overtones of the.

Which insect flaps its wings more often in flight. a bumblebee, a mosquito, or a fly? Why do you think so??

The higher the frequency, the higher the sound. Consequently, the mosquito, flaps its wings more often.

The teeth of a rotating circular saw create a sound wave in the air. How will the height of the sound produced by the saw change when it is idling if you start sawing a thick plank of thick wood on it?? why?

The pitch of the sound will decrease, t.к. The speed of the circular saw will decrease.

It is known that the tighter the string on the guitar, the higher the sound it produces. How the pitch of guitar strings will change when the ambient temperature rises considerably? Explain the answer.

As the temperature rises, the guitar string stretches, thus the oscillation period increases, and the frequency and pitch of the sound decreases.

## Step-by-step algorithm for beginners: from preparation to starting and stopping the saw

The following tips and recommendations will be useful both for beginners and more advanced users of circular saws.

You need to cut sheet plywood. What you need to do?

• The plywood plate is fixed on the workbench with the help of clamps, so that a part of plywood is above the table.
• Check the stability of the table and workpiece.
• There must not be any foreign objects and dirt under the plywood.

Next is the work with the circular, which is divided into two steps:

the circular saw adjustment is the adjustment of the necessary gap between the guide pin (aka riving knife) of the circular saw and the saw blade. At the same time, the distance between the edge of the spike and the teeth of the disk should not exceed 0.25 mm. Otherwise the circular saw blade vibrates.

Most circular saws are sold with a fixed stud, but after a few years of use the stud will start to wear out and play will appear. If the circular saw is new, simply carry out a control test.

A complete check of the circular saw is as follows:

• The device is held in your hands with the disc away from you. Of course no one must be in front of the sawmill.
• The disk rotation button is pressed. It should be pressed “yielding” to the acceleration of the disc, released, and pressed again. The rotating sound is smooth, without any extraneous noise, and the circular saw is easy to hold.

### Types of work performed

The following jobs can be done with circular saws:

• If two workpieces are laid in the same plane, they can be faced mutually. You can do the same thing with a wide board if you put a special stop on it.
• Batten boards can be trimmed if they are to be butted together, for example in a flooring installation.
• A bevel or angle can be removed from the end of the board.
• It is possible to make longitudinal and cross cuts at an angle.
• A quarter or groove can be chosen from a timber or a board.
• Sheets can be cut in all directions with a special cutting guide.
• The circular saw can cut plastic or any hard plastic.
• Manual circular can be mounted on a carriage or table for stationary use.

## Why does the circular saw sound low when a board is pressed against it??

The Sound Wave Journey Theme 3 “Sources of Sound” 3.1. This source of sound was invented for the option of musical instruments 3.2. Which contributes to the volume of the guitar sound? 36. Body of a certain shape with a hole. 3.3. This source of sound is named after the heroine of an ancient Greek myth 3.4. When a shock wave runs into sound vibrations? 39. In an explosion, in a bullet, in lightning 3.5. Can a student’s ruler be source of sound waves?? 3.6. Which statement is correct: 1) every sounding body vibrates; 2) every vibrating body sounds? 30. The first statement is correct. 31. Correct the second statement 3.7. A race judge stands at the finish line. When he should start his stopwatch: when he sees the smoke of the starting pistol or when he hears the shot? 301. When it sees smoke. 302. When he hears the shot 3.7. Why does the sound pitch of a circular saw decrease when it is pressed against a board? 308. Reduced saw rotation speed. 306. The saw’s rotational speed increases 3.9. What is called a timbre? 300. Sound coloration depending on the sound source. 305. The coloring of a sound depending on the volume 3.10. Why can’t we talk on the moon?? 311. No medium carrying a sound wave. 318. We’ll be in a spacesuit 3.11. What are the benefits of seismic waves? 303. Helping to find an oil field. 316. Destroy old buildings

Knowledge Update 1. What is sound? 2. State the cause of sound. 3. State the physical characteristics of sound. 4. Mechanical vibrations of which frequencies are called sound? Sound pressure level, dB Leaves, surf The alarm clock chime The player The sound of an airplane engine Calms You become irritable, fatigued, have a headache 114 Causes alcohol-like intoxication, disrupts sleep, destroys the psyche, leads to deafness. Pain sensation 130 20 80 Violoncello Saxophone Balalaika Why does a bullet fired from a gun whistle, but a bullet thrown by hand fly silently? Why does the circular saw sound low when a board is pressed against it? Which flaps its wings more often in flight: the fly or the mosquito? Which expression is always true: a) every sounding body vibrates; b) every vibrating body sounds. 2. How would the loudness of a sound change if the amplitude of its source oscillations were decreased?? a) will decrease; b) will increase; c) will not change. 3. What does the pitch of a sound depend on? a) amplitude of vibration; b) frequency of vibration; c) speed of sound. 4. In what units is the volume of sound measured? a) decibels; b) sleep; c) Hz. 5. What is the fundamental tone ? a) The quality that allows you to distinguish the sounds of some sources from the sounds of others; b) The highest frequency of a complex sound; c) The lowest frequency of a complex sound. 1. Answers: 1a; 2a; 3b; 4b;5c. Homework 1)§35, 36, answer paragraph questions. 2) (for those who want to get an “A”) Answer the question: “What is the difference between a major and a minor in terms of physics?”.