Because all the objects have a natural frequency
a lyre bird can imitate 20 sounds of species of birds and some sounds of human objects
Some of the objects that make soft sounds include the soap, wringing hands, moist lips and the gentle breeze.
Sound is created by the vibration of air. The faster the vibration, the higher the sound. Smaller objects can vibrate faster than larger objects (of the same kind) and therefore have a higher pitched sound.
Their are fewer sounds to memorize then there were objects and ideas to be represented.
Pitch of vibrating objects is determined by the frequency of their vibrations. Objects that vibrate at a higher frequency produce higher pitch sounds, while objects that vibrate at a lower frequency produce lower pitch sounds.
Different objects make different sounds when dropped on a floor because of their material composition, shape, and size. These characteristics determine the object's density, elasticity, and surface area, which all influence how the object interacts with the floor upon impact, creating unique sound frequencies.
When objects vibrate quickly, they produce higher-pitched sounds. The frequency of the vibrations determines the pitch of the sound, with faster vibrations corresponding to higher pitches.
echolocation
Echolocation
there are more..but what i can think of at the moment would b a hole in the exhaust,, or perhaps the exhaust breaking off from the manifold....worn cv joints, fan out of balance and hitting against sumthing
By slowly vibrating objects and rapidly vibrating objects respectively.