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- It is a form of energy that causes particles of matter to vibrate back and forth.
- Sound travels through materials as a wave of pressure.
- We can simply define it as "an energy associated with the vibrations of sound waves."
- In order to produce a sound, something has to move when an object vibrates and we call this mechanical energy. Hence, sound energy is a mechanical energy source.

Sources:
https://www.softschools.com/examples/science/sound_energy_examples/50/

https://sciencetrends.com/sound-energy-definition-and-examples/

https://www.youtube.com/watch?v=-J9HhdgV1cY

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1. Vocal cords of living things
- Vocal cords vibrate from air pressure, making sound.

Source: https://www.google.com/imgres?imgurl=https%3A%2F%2Fthumbs.dreamstime.com%2Fb%2Fvoice-emitting-sound-via-voice-chords-face-vocal-cord-icon-w-person-image-vector-illustration-102250426.jpg

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- stored in the bonds of atoms and molecules.
- this energy is released when a chemical reaction takes place.

EXAMPLES:
food, biomass, petroleum, natural gas, and coal.

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> It is known as the sum of potential and kinetic energy in an object that is used to do work.

> It is the energy stored in moving objects.

> It is the movement of objects and substances from one place to another.

ex. Wind, a ball being thrown, running, a fish swimming, a ball being kicked

source: https://ei.lehigh.edu/learners/energy/readings/energy_basics.pdf

https://www.solarschools.net/knowledge-bank/energy/types/motion

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- A kind of energy that is derived from the movement of electric charge.
- When the charge moves from a higher electric potential to a lower potential, it delivers an electric current.
- It has two types: Static electricity (comes from friction) and current electricity (comes from an electrical charge traveling through a current)

source:
https://examples.yourdictionary.com/electrical-energy-examples-in-action.html

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2. Percussive Instruments
- Percussive instruments such as piano, drums, etc. are operated through striking them with a hammer or similar tool in order to vibrate. The drumhead or piano wire vibrates in its own way, creating the sound waves that travel through the air.

Source:https://www.google.com/imgres?imgurl=https%3A%2F%2Fimage.flaticon.com%2Ficons%2Fpng%2F512%2F22%2F22183.png

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- The energy acquired by the objects upon which work is done is known as mechanical energy.

- Mechanical energy is the energy that is possessed by an object due to its motion or due to its position.
- Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position).

ex. Wrecking ball, hammer, windmill, dart gun, and bow & arrow

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-It is defined as the potential energy a massive object possesses in relation to another massive object due to gravity.
-It also refers to an object's stored energy based on its distance away from the earth.

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3. Electronic instruments
- Electronic instruments are operated by creating electrical vibrations. The circuits within the instrument create different waveforms that either mimic the sounds of traditional instruments or create new sounds altogether. For example:
A synthesizer

Source: https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.flaticon.com%2Fsvg%2Fstatic%2Ficons%2Fsvg%2F186%2F186009.svg

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- Thermal energy is one of various types of energy where energy can be defined as the ability to do work.

- It refers to the energy contained within a system that is responsible for its temperature.

- The faster the particles move within an object or system, the higher the temperature that is recorded.

Ex. bonfire, melting ice, boiling water, rubbing your hands, and bread toaster.

Source:
https://www.khanacademy.org/science/physics/work-and-energy/work-and-energy-tutorial/a/what-is-thermal-energy

https://great-home-decorations.com/what-is-thermal-energy-definition-examples/

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4. Nature
- like how lightning explosively heats air, sending sound waves we hear as thunder. Wind, produced by heat from the sun, makes noise through setting objects into vibration. Wind can howl against itself when it gusts.
For example: The figure below explains how energy is released when falling water hits a beach makes the sound of surf.

Source: https://www.google.com/imgres?imgurl=https%3A%2F%2Fwww.clipartmax.com%2Fpng%2Fmiddle%2F137-1378369_sea-waves-variant-comments-ocean-icon-png.

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5. A baseball player hits a ball

Source: https://www.google.com/imgres?imgurl=https%3A%2F%2Fcdn4.vectorstock.com%2Fi%2F1000x1000%2F67%2F08%2Fbaseball-sport-icon-vector-20746708.jpg

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- The energy of electromagnetic waves. These waves can travel through space.
- made up of tiny particles called photons

ex: Sunshine, Solar Cells, X-Rays,  Microwave, Cellphone

Source: Radiant Energy - Knowledge Bank - Solar Schools

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Nuclear energy is the energy in the nucleus, or core, of an atom. Atoms are tiny units that make up all matter in the universe, and energy is what holds the nucleus together. There is a huge amount of energy in an atom's dense nucleus.

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https://studiousguy.com/examples-mechanical-energy-everyday-life/

https://studiousguy.com/examples-mechanical-energy-everyday-life/

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1. Doorbell
https://images.app.goo.gl/HFCRYVxy7fx8JZmj9

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2. Audio speakers
https://images.app.goo.gl/ewnGYZcJjq8erkAN8

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3. Cellphone
https://images.app.goo.gl/rK6N2haSxXLHm3pK6

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4. Light bulbs
https://images.app.goo.gl/w88UNM1fwxjEMdEc6

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5. Wristwatch
https://images.app.goo.gl/b92rHuWDwUTo59268

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https://www.thoughtco.com/example-of-chemical-energy-609260

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Example 4: Any object that is falling down

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Example 4: Any object that is falling down

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Example 5: Planets orbiting around the Sun

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Example 5: Planets orbiting around the Sun

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https://www.solarschools.net/knowledge-bank/energy/types/gravitational

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http://www.nationalgeographic.org/