Category: Science
My Grade 4 Sound Unit
Hello everyone! Welcome to my grade 4 sound unit! In this blog I’ll be talking about quite a few things. They are:
- What is sound?
- What are some of the properties of sound?
- What are vibrations?
- How does sound travel?
- what are vibrations?
- What are pitch and volume?
- How does the ear work?
What is sound?
Sound is made when something vibrates and makes molecules hit others until it reaches our ears where we hear it as sound.
Just because I can, here is the official definition of sound; “Sound is a travelling wave which is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing and of a level sufficiently strong to be heard, or the sensation stimulated in organs of hearing by such vibrations”.
What are four of the properties of sound?
- Sound travels
- Sound can be reflected
- Sound can be absorbed
- Sound can be modified
How does sound travel?
Sound travels in waves. When a stone is dropped in a lake, ripples in the water travel outward until they hit shore. Think of the stone hitting the water as a sound being made, the ripples sound waves, and the shore our ears. That is how sound travels. I have done an experiment involving a tuning fork, water, and salt. First, I tapped the tuning fork on a hard surface and hovered it over the salt. the salt didn’t move. next, I did the same thing but this time I tapped the tuning fork on a hard surface multiple times. there was little movement. Finally, I did the same thing but this time I lightly touched the salt. The salt was literally jumping! Next I did the same thing but with water. there were similar results but instead of jumping it was just travelling outward. here are some videos:
Pt. 2
How does the ear work?
Click HERE for a video.
What are vibrations?
Click HERE for a video.
Any thoughts?
I think I did a great job with my sound unit but I wish I was here for more of the fun.
My Grade 4 Light Unit
Hello everyone! Today I will be talking about my first grade 4 science unit, light!
- First, we studied about natural and artificial light! Let me share some fun facts:
- Natural light means light sources created by nature. Here are some examples:
Sun, stars, fireflies, and fire.
- Artificial light means light created by us. Here are some examples:
Lightbulb, glowstick, oil lantern, and candle.
After that, I tested my hypothesis that light travels in straight lines. here is my experiment:
Next we studied about luminous and non luminous. Here are some fun facts:
- Luminous means something makes its own light. Here are some examples:
Sun, stars, anglerfish, and fire.
- Non luminous means something doesn’t make its own light; it needs some help. Here are some examples:
Moon, certain street signs, reflective clothes, and cinema screens.
After that, we studied how light reflects. Here is my experiment:
We also learned about transparent, translucent, and opaque. Here are some things I learnt:
- Transparent means that a material is see through. here are some examples:
Glass, drinking water, and thin ice.
- Translucent means that a material allows you to see through, but the image is not clear. here are some examples:
tinted car window, thin jelly, and murky swamp water.
- Opaque means that it does not allow you to see through. Here are some examples:
brick wall, concrete pillar, lead pencil.
Finally, we learned about refraction. Light travels slower in water than air, so it refracts, or bends, the light. here is a picture of me working on this:
Reflection Of Learning
I love science so far! We have done so many different (and fun) science experiments! I would love to learn about EVERYTHING!!!!!!!!!!!!!!!!!!!
Pioneer project
Here is some of the work I did before the project
This is some of my research
These are the original plans for the building
This is how it turned out.
Hey guys! It’s Nancy here! I just finished working for the day! It’s hard at this time of year. Summer is coming up soon so we’re struggling to get the weeds under control. All our tools are no longer good so we have to go to the shop. I got a deal on garden stuff so I won’t have to pay too much. It rained a lot so we couldn’t stay dry. This is our forecast: rain. Rain. RAIN. I hate rain. Turns out, the general store owner has some new mail so I’m out. Thanks!
This is my blog post from the point of view of a pioneer.
This is my pioneer instagram post.
This is my old letter.
Pollution
Hi! It’s me again, today we’re talking about pollution and other issues with the environment. We will start by talking about pollution. Pollution is something that hurts the environment such as garbage, gases, and sewage. Us humans are making lots of gas from factories, cars, and even some lawnmowers! There’s also land pollution. Land pollution is caused by garbage being thrown on the ground also known as littering. Last but not least there is water pollution. Water pollution is caused by dumping sewage and other very gross substances in the water. I would love for pollution to disappear. But us humans are doing other things that damage the ecosystem such as illegal hunting. In case you don’t know, illegal hunting, also known as poaching is where people illegally kill animals. Poaching is especially common in Africa where they kill elephants and rhinoceroses. These animals have Horns made of ivory which is a material that used to be used to make piano keys and other things. Trading ivory is illegal but people still do it. Now there’s logging. In case you don’t know, logging is where people cut down trees and destroy habitats. This is really bad because trees help turn carbon dioxide into oxygen and it is really important.
Now here is habitat loss. Habitat loss is where an animal’s habitat is destroyed. Habitat loss can be caused by things like logging, global warming, and creation of new factories.Here are some of the ways you can help:
Pollution
Hi! It’s me again, today we’re talking about pollution and other issues with the environment. We will start by talking about pollution. Pollution is something that hurts the environment such as garbage, gases, and sewage. Us humans are making lots of gas from factories, cars, and even some lawnmowers! There’s also land pollution. Land pollution is caused by garbage being thrown on the ground also known as littering. Last but not least there is water pollution. Water pollution is caused by dumping sewage and other very gross substances in the water. I would love for pollution to disappear. But us humans are doing other things that damage the ecosystem such as illegal hunting. In case you don’t know, illegal hunting, also known as poaching is where people illegally kill animals. Poaching is especially common in Africa where they kill elephants and rhinoceroses. These animals have Horns made of ivory which is a material that used to be used to make piano keys and other things. Trading ivory is illegal but people still do it. Now there’s logging. In case you don’t know, logging is where people cut down trees and destroy habitats. This is really bad because trees help turn carbon dioxide into oxygen and it is really important.
Now here is habitat loss. Habitat loss is where an animal’s habitat is destroyed. Habitat loss can be caused by things like logging, global warming, and creation of new factories.Here are some of the ways you can help:
1.Bikes Please! Riding your bike is not only good for the environment, but also good for you!
2.Who turned on the lights! To save energy turn off the lights if you are out of the room for more than 5:min. (Unless your little sis is in the room!)
3.3 Rs! Reduce, Reuse, and Recycle!
4.Don’t. Take. Long. Showers. Your mother has told you! Your father has told you! It’s not only rude to use up the hot water but it is also very bad for the environment!