1. Knock on the tires is, the tone is high when the air is sufficient, or the air

For the sound, the higher the frequency, so the tire will be quickly pressed back by the pressure after deformation, so when the tire is fully inflated, the sound tone is high, and when the air is sufficient, the air surface pressure is strong, the tension is large, and the binding force is large, so it will produce a fast and powerful vibration, the higher the tone, and the frequency of the air vibration is the same as the frequency of the source.

1. When you knock on the tire, is the tone high when the air is enough, or when the air is insufficient? Why?

It's similar to playing the piano. The tighter the strings, the greater the tension, the faster the vibration frequency, and the higher the pitch. The tires are full of gas, the tension is high, and the frequency is high. The pitch is high.

2. Two tuning forks stand at a short distance apart, when striking a yin tuning fork, the other will also vibrate, it can be said that air can transmit sound, and sound can transmit energy?

Sound itself is the transmission of energy. We hear sounds, which explain sound waves, that make our eardrums vibrate. Air is the medium through which sound is transmitted.

3. When knocking on the water piano bottle, the more water, the lower the tone, is this related to the volume of water or the height of water?

1.The sound of knocking on the bottle is mainly caused by the vibration of the bottle itself.

2.The pitch of the bottle knocking sound decreases as the amount of water in the bottle increases.

3.As the water in the bottle increases, the tone of the blowing sound becomes higher with the increase in the water in the bottle.

The pressure in the tire is high, so that the tire is struck at a fast frequency and small amplitude, so the tone is high-pitched.

Automobile tires can be divided into two types: car tires and truck tires according to their uses. Car tires are mainly used for pneumatic tires for cars, and truck tires are mainly used for pneumatic tires on trucks, buses and trailers. Automobile tires can be divided into pneumatic tires and solid tires according to the carcass structure.

The vast majority of modern cars use pneumatic tires, while solid tires are only used on low-speed cars or heavy-duty trailers driving on trunk roads with asphalt concrete surfaces.

As far as pneumatic tires are concerned, they can be divided into two types: tubeless tires and tubeless tires according to different compositions.

According to the working pressure in the tire, it can be divided into three types: high-pressure tires, low-pressure tires and ultra-low-pressure tires; According to the different directions of the cord arrangement in the carcass, it can be divided into ordinary bias tires, bundled bias tires and radial tires, and according to the different tread patterns, it can also be divided into ordinary pattern tires, mixed pattern tires and off-road pattern tires.

The above content is referenced: Encyclopedia - tires.

Hit the tires with an iron rod and the higher the pitch of the sound when there is enough air inside the tires.

When an iron rod is taken and the wheel is hit, the tire vibrates at different frequencies, and the tone of the sound will be different, that is, the more sufficient air in the tire, the faster the tire vibrates when striking, and the higher the tone of the sound; Therefore, the sound level can be used to determine whether the air inside the tire is sufficient.

Precautions for the use of car tires:

1. Tire positioning, in the process of driving the car, if you find that the tire is eccentric or the vehicle is over-shaken, please detect the tire positioning in time. If not solved in time, it will affect the handling of the vehicle, and in serious cases, it will also be dangerous.

2. Check the tire pressure of the car frequently, the tire pressure directly affects the use of the tire, and the tire pressure is too low to increase the friction between the ground and the tire, resulting in accelerated tire wear. Therefore, it is advisable for car owners to check their tire pressure once a month, and the tire pressure value should be based on the parameters recommended by the vehicle manufacturer.

3. When the tire is worn to the wear indication to stop using, it is generally designed at the position of about millimeters of the remaining depth of the tire groove, and the tire is worn to this sign when it must be replaced. Because tires that exceed the wear indication sign are dangerous when driving in wetlands, due to their greatly reduced drainage, which seriously affects wet grip.

4. Avoid hitting obstacles, when the vehicle is driving at high speed, if the tire hits the pothole and other obstacles, it will cause serious deformation of the tire between the obstacle and the rim flange, resulting in bulging or sudden tire deflating.

Sound is produced due to the vibration of objects, and objects with high density vibrate at a high frequency, and the smaller the effective vibration length (area, volume), the higher the vibration frequency. The higher the frequency, the higher the pitch.

The more gas the tire, the denser the gas inside, and the higher the internal vibration frequency when beating, so the tone is high.

The more water there is, the less water there is, the smaller the effective vibration area, the higher the frequency, and the higher the natural tone. The strings are also effective vibrations, the shorter the part, the higher the pitch!

There is water in one medium i.e. liquid and one does not.