Kinetic Energy To Sound Energy:How to Convert, When, Where, Examples And Facts


In this article we are going to describe the conversion of kinetic energy to sound energy with illustrative examples.

A very common example of kinetic energy to sound energy is playing piano. When we play piano,our fingers are used to moving on the piano. From this kinetic energy is produced and gets passed on to the piano. After that hammers strike strings and now sound is produced.

Striking of the hammer signifies more kinetic energy which in turn transforms into sound energy.

How are kinetic and sound energy related?

A body acquires kinetic energy during its motion. Sound waves are produced while we play a musical instrument. It means that kinetic energy is changed to sound energy. But if that instrument remains at rest,the energy is stored as potential energy in it.

How is kinetic energy converted to sound energy?

We know in an inelastic collision the two colliding bodies combine with each other after collision. As energy is not conserved in an inelastic collision,a part of kinetic energy gets lost to combine the two colliding bodies. This lost energy is converted to sound energy.

When kinetic energy is converted to sound energy?

When an inelastic collision takes place between two bodies then there is a loss of kinetic energy after the collision. This lost part of kinetic energy is transformed into sound energy and heat energy.

Where is kinetic energy converted to sound energy?

When we beat a drum, kinetic energy is transferred to the membrane of the drum. Then the membrane starts to vibrate. The air particles that are associated with this membrane also start vibrating. This vibration generates sound energy.

Kinetic energy to sound energy formula

E sound= E pot + E kin

E sound = ∫p^2/2d0c^2 dV + ∫dv^2/2 dV                                                                         

Where p= pressure of sound,v=velocity of the particles of the medium,d0= density of the medium in the absence of sound energy,E pot =∫p^2/2d0c^2 dV and E kin=∫dv^2/2 dV                                                                

Kinetic energy to sound energy efficiency

We know efficiency=output energy/input energy X 100%. In the transformation of kinetic energy to sound energy,output energy is sound energy and input energy is kinetic energy. Hence efficiency= sound energy/kinetic energy  X 100%

Kinetic energy to sound energy examples

20+ examples with detailed facts of kinetic energy to sound energy conversion are stated below:

Playing a piano

A common example of kinetic energy to sound energy conversion is playing a piano. When a piano is being played, movement of our fingers generates kinetic energy that transfers to the piano. After that the hammer inside the piano strikes  the strings (kinetic energy) and sound energy is produced.

Piano from hwikipedia

An inelastic collision

In an inelastic collision a part of kinetic energy is lost due to collision which in turn changes to sound energy and heat energy.

Beating a drum

When the diaphragm of a drum is beaten the air molecules associated with it start vibrating which in turn produces sound. In this way kinetic energy to sound energy conversion occurs.

The flow of water in a waterfall

The flow of water in a waterfall is another example of kinetic energy to sound energy conversion.

Ringing of an electric bell

When an electric bell rings,at first electrical energy is converted into kinetic energy and after that kinetic energy transforms into sound energy.

An electric bell from wikipedia

Playing a violin

Violin is a stringed musical instrument in which the movement of strings i.e, the kinetic energy changes into the sound energy.

Playing a guitar

Playing a guitar is a very common example of kinetic energy to sound energy conversion.

A vacuum cleaner

At first electrical energy is converted into the kinetic energy which in turn transforms into heat and sound energy.

An exhaust fan

The movement of the blades of an exhaust fan is an example of kinetic energy. This kinetic energy then changes into sound energy.

A trumpet

The blowing air column produced by the closed lips forms standing sound waves inside a trumpet. The vibration of these air molecules produces sound(kinetic energy to sound energy).

A saxophone

A saxophone is a musical instrument in which kinetic energy to sound energy conversion occurs.

A horn of a car

In a horn at first electromagnetic energy is turned into kinetic energy while pressing it. After that this kinetic energy is converted into sound energy.

A whistle

The working principle of a whistle is based upon the vibration of the air column in it. This is also a common example of kinetic energy to sound energy conversion in our daily life.

A loudspeaker

The diaphragm of a loudspeaker vibrates to produce sound in it. It means that kinetic energy is produced in this vibration from electrical energy and then it turns into sound energy.

Air conditioner

In an air conditioner kinetic energy transforms into sound energy.

A radio

The energy conversion of a radio is the same as that of a loudspeaker. Kinetic energy to sound energy conversion also takes place in it.

A mixer grinder

When a mixer grinder is connected to the circuit,electricity is passed through it and the blades start to rotate. It means that initially electrical energy is turned to kinetic energy and then this energy transforms into sound energy in a mixer grinder.

A sitar

Sound production in a sitar is a notable example of kinetic energy to sound energy conversion. It is also a stringed musical instrument.

A sitar from wikipedia

A dot matrix printer

While a dot matrix printer produces dots on the paper, noise is generated. It means that kinetic energy to sound energy conversion takes place in it.

A dot matrix printer from wikipedia

A hammer

When a hammer strikes an object kinetic energy to sound energy change is converted.

Kinetic energy to sound energy transformation in a hammer from wikipedia

Ankita Biswas

Hi...I am Ankita Biswas. I have done my B.Sc in physics Honours and my M.Sc in Electronics. Currently, I am working as a Physics teacher in a Higher Secondary School. I am very enthusiastic about the high-energy physics field. I love to write complicated physics concepts in understandable and simple words. Let's connect through LinkedIn:https://www.linkedin.com/in/ankita-biswas-b95785230

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