Waves Lesson for Kids: Grades 3-5, Sound, Water, Wavelength, Amplitude
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# Sound Waves & Water Waves For Kids!

Watch the clip and read more below.

A fun science lesson and video on wave properties for kids in 3rd, 4th and 5th grade!

DEFINITION OF WAVES

Waves are a pattern of motion that transfer energy from place to place without transferring matter. There are different types of waves. Sound waves travel through air and allow us to hear sound. Water waves move on top of water. Light waves move in straight lines through space. On this page we will focus on sound and water waves.

To better understand the different types of waves…

## LET’S BREAK IT DOWN!

### Energy travels through waves.

Waves transport energy, not matter, from place to place. Remember that matter is made of particles too small to be seen.

Particles are required to transport some types of waves, such as sound waves. When the wave travels, the particles do not travel with the wave. It may appear that ocean waves are moving particles of water toward you, but in fact, the water is only moving up and down.

We can test this by placing a heavy ping-pong ball in a wave tank. The waves move from one side of the tank to the other, but the ping-pong ball does not travel, it only moves up and down.

Scientists put waves into two general categories: transverse waves and longitudinal waves. Transverse waves vibrate perpendicular to the direction that the wave travels. Ocean waves are a great example of a transverse wave. “The wave” at a sporting event is also a transverse wave.

Longitudinal waves vibrate in the same direction that the wave travels. Picture standing at one end of a spring toy, with a friend holding the other end. If you pull your end and let go, you will create a compression in the spring that travels down its length. Sounds waves are an example of longitudinal waves.

### Amplitude is the height of the wave.

Amplitude is a measure of the wave’s height. It also tells us how much energy a wave has. Waves with more energy have higher amplitudes.

The amplitude of a sound wave determines the sound’s loudness. When you turn the volume up on the TV, you are increasing the amplitude of the sound waves.

### Wavelength is the distance between wave peaks.

Wavelength measures the distance between wave peaks. The closer the peaks of the wave are to each other, the more energy the waves have. The opposite is also true: when the wavelength is longer, the waves have less energy.

### Sound waves travel through the air.

Sound waves are caused by vibrations. Since air is made of particles (matter), it transports sound very well. When a speaker vibrates it creates longitudinal waves that travel in ALL directions.

You can easily see how speakers create vibrations by sprinkling something small and light, like salt, onto a speaker. The salt particles will bounce due to the vibrations. Since sound waves travel in all directions you can hear sound even when you are not directly in front of the source.

Most of the sounds we hear travel through the air, but sound can also travel through solids and liquids too. Some solids, like metal and glass, are good at transmitting sounds. Other solids, including heavy fabrics and foam, muffle sounds. Sound can also move through liquids. Some animals, such as dolphins and whales, communicate underwater by using sound waves. We call that “echolocation.”

In order for sound to travel, it must move through some type of matter. In outer space, there are no air particles through which sound can travel. In other words, if there is an explosion in space, it will be silent. You can test this by placing a phone in a vacuum. When music is turned on, no sound will be heard.

## EXAMPLES OF THE DIFFERENT TYPES OF WAVES

Dolphins make sounds that travel as underwater waves. These sounds help dolphins navigate, communicate with each other, and find food. We call it echolocation.

Earthquakes travel as waves too. Earthquakes can transmit so much energy that they topple buildings and destroy property. By understanding how these waves travel we can warn people when there is an earthquake in their part of the world.

Amplifiers make music louder. Rock stars use electronics to increase the amplitude of their sound waves. That means they use electricity to make the speakers vibrate with more energy, which increases the amplitude. Rock on!

## WAVE PROPERTIES VOCABULARY

Amplitude
The height of a wave. Usually measured from the wave's resting point to the peak of the wave.
Wavelength
The distance between wave peaks. Usually measured from the peak of one wave to the peak of the wave next to it.
Energy
It makes things happen! (Or more formally: the ability to do work)
Wave Peak
The highest point on a wave. Also called the crest.
Sound Waves
Vibrations of air particles that transmit sound. Sound waves are a type of longitudinal wave.
Transverse Wave
When the disturbance moves perpendicular to the direction of the wave. Put simply: When a wave moves up and down.
When the disturbance moves parallel to the direction of the wave. Put simply: When a wave moves forward and back.
The smallest possible unit of matter.

## WAVE PROPERTIES DISCUSSION QUESTIONS

### Do waves transfer matter?

Waves transfer energy, not matter.

### When Zoe and Izzy demonstrated waves using the spring, which type of wave did they observe?

Zoe and Izzy use the spring to demonstrate both transverse and longitudinal waves. Water waves are transverse waves and sound waves are longitudinal waves.

### Why does the salt vibrate on the speaker when the music is turned on?

When the music is turned on sound waves cause the salt to vibrate just like sound waves cause air particles to vibrate.

### Why can’t sound be heard when the phone playing music is placed inside the vacuum jar? Explain what you think is happening.

When the phone playing music is placed inside the vacuum jar and the vacuum is turned on, all of the air is removed from the jar. Since there are no air particles for the sound waves to travel through, the sound cannot be heard even though the music is still playing.

### What kinds of patterns can be observed for transverse waves?

Transverse waves are a repeating pattern of peaks and troughs. This pattern remains the same although changes to the energy cause the peaks and troughs to get closer together or further apart (wavelength) or the peaks and troughs to be higher or lower (amplitude).

### What kinds of patterns can be observed for longitudinal waves?

Longitudinal waves are a repeating pattern of compression and expansion. This pattern remains the same although changes to the energy causes the compressed areas to become closer together or further apart (wavelength).

### How does increasing energy affect the amplitude of a wave?

Adding energy to a transverse wave causes the wave to become taller (amplitude increases).

### How does increasing energy affect the wavelength of a wave?

Adding energy to a wave causes the wavelength to become shorter, meaning the waves are closer together (wavelength decreases).
We Cover All Major Science Standards in Grades 3-5
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