Excuse me, there is a road under Mount Fuji where cars can produce music. What is the principle? Please be more specific.

It is caused by friction. There are large and small grooves on the road surface, and the friction between automobile tires and grooves causes the road surface to make a sound.

Specific introduction:

Japan is mountainous, and roads are built according to the terrain. On the Panshan Road leading to Mount Fuji, the clever Japanese designed and built a nearly 200-meter music road here. It's amazing that tires can play wonderful music when driving across the road. It turned out that when workers were repairing roads, they would cut out small grooves with different intervals. When the vehicle passes by, the tire will rub against the ground and the groove, producing notes with different heights, forming a coherent song, and music is thus produced. Usually keep the speed of 50 kilometers per hour, and you can hear the perfect pitch and rhythm. It can play music for about ten seconds, which not only achieves the purpose of slowing down the vehicle, but also brings pleasant mood to tourists. Fantasy shows the wisdom of human beings.

A note will be marked on the road near the music area. That is, vehicles will slowly pass through this section of the road, and all of us sitting in the car will hold our breath and listen quietly. Sure enough, there are waves of low and slow tunes on the road under the carriage! It is said that the song is also called Mount Fuji. It is said that the first half is played when going up the mountain, and the second half is heard when going down the mountain.