Monday, May 20, 2019

Super Science!

Last week, our class had a great time discovering some of the scientific principles that govern whether an object will float or sink.

We started off with a simple enough question: will plasticine float? We tried it out by dropping a ball (slightly larger than a golf ball) into a bucket of water. What happened? It sank like a rock to the bottom!

Mr Sanderson then told us a fact which we all knew, but that we hadn't really thought about before. A lump of steel will (obviously) sink in water, but battleships are made from steel and they can this be?

After some thought, we came up with the idea that it must be the thickness and the shape of the material that determines if it will float or sink. We then broke into pairs, were given a lump of plasticine and told to go and try to make it float. After only a few moments, we worked it out - you had to make the plasticine thin, and mould it into a boat shape. We tried it and voila! We had made our plasticine float!

Mr S then set us a second challenge. He gave us access to a box of 2cm wooden cubes and told us to see how many blocks our boats could hold before they did a 'Titanic' and sank to the depths of the bucket ocean. At first, our mighty vessels would only hold approximately 10 blocks, but then we started to modify our boats by making the walls thinner and the bottom (he called them 'hulls') wider and longer. Before long, we were able to place over 20 blocks on our boats.

Being the competitive souls that we are, we then had a competition to see whose boat could hold the most. Finn and Raymond were locked in a deadly battle with Samara, to earn the title of 'Most Excellent and Brilliant Boat Builder'. In the end, both teams ended up with their boats being able to hold 38 wooden blocks. This beat last year's record of 34, which was held by Alka and Shreya. 

Now for the 'sciency' bit! - Why DO some things float and others don't?

What causes some things to sink and float? Well, it’s all about something called density. Do you know what density means? Well everything around us is made up of tiny molecules. In some objects tiny little objects called molecules are jam packed together, and in others they are loosely packed together.  This is actually what density means. The objects that are jam packed together have a higher density, and the more loosely packed objects aren’t as dense.

Let’s think for a minute about other large objects like a boat, or maybe even an airship. How does this sink and float work? Some boats are massive, and would seem very dense, so how do they stay afloat? Well basically the boat has to push the water aside so that there’s room for it. As it’s so heavy it actually gets pulled down by gravity. But there’s more to this. Now comes buoyancy, which is the opposite of gravity.

But what is buoyancy? Think about what happens when you put an ice cube into a glass of water. As the ice cube moves some of the water to make way for itself, the water level rises and floats partially in and out of the water. Gravity is pulling the ice cube down and the buoyant force is pushing it up. How far in or out of the water your ice cube stays depends on its density, as that is what the pushing and pulling forces are working against.

Easy, right?


  1. Hey,
    I am an academic writer at Online Assignment Expert. I am a regular reader of your blog and article. I really found it quite amazing, informative and interesting as well. I like the way you organise the content and the sources you use to find information and data. Anyhow, I am here to inform the students studying at Australian colleges or universities that we are offering accounting assignment help. Students who encounter problems in doing their assignment or need any type of other assistance can contact us. You will find a team of academic writers who have completed their studies from the most reputed college and university. They are here to deliver an errorless and genuine accounting assignment help service.
    Our assignment expert holds a PhD degree in the field of accounting and finance. They have years of experience in producing assignments for accounting.
    Therefore, in case you need assistance from the services like assignment help Australia visit our official website.

  2. I am really impressed with you for the selecting of a new and unique topic and also the well-written blog on it. Thanks for sharing with us. We also provide blog Assignment Help services in Australia.

  3. One of the best articles that give business analytics assignment help to the students studying this course. I am an assignment help expert at My Assignment Services, a known name among the students when it comes to business analytics assignments. We are a team of more than 500 experts spread across the globe and delivering quality content to every student who comes to us for auditing assignment help, business analytics assignment help or any other subdomain of business analytics. There are a number of things that the students need to keep in mind while writing their assignments and such tips and explanations can only go a certain length. Therefore, we are offering a customised business analytics assignment help where we prepare your entire assignment help from scratch delivering a high-quality content like hundreds of before. Embark on an academic journey and get the most professional and affordable assignment help today!

  4. A special thanks to My Assignment Help for providing a well-written assignment. You guys were a savior to me. Will contact you soon for my upcoming assignments. You can email us at cs@Myassignmenthelpau.Com or Phone Number: +61-2-8005-8227

  5. Thank you for sharing this informative is giving dissertation conclusion help to students.we are already trusted by thousands of students who struggle to write their academic papers and also by those students who simply want online accounting dissertation to save their time and make life easy.

  6. "I enjoy kinds very own post. It will be respectable to get a single narrative inside and outside of the core of this distinctive core specialized niche will likely be commonly knowledgeable.
    Project Management Assignment

  7. Hope you will keep on offering good content like this more often. I feel more and more people should know about this. Also, I agree on most of the points you have made.
    Ikea dubai

  8. For a change, there is an article that focuses on a specific topic and is not all over the places. I like the fact that it is actually problem-solving and not just random and baseless subject. Great going!
    Management Assignment Help


  9. Thank you for good, Good post. I was very interested in the article, it's quite inspiring I should admit. I like visiting you site since I always come across interesting articles like this one. Great Job, I greatly appreciate that. Do Keep sharing! Regards

  10. Hello, I have browsed most of your posts. This post is probably where I got the most useful information for my research. Thanks for posting, we can see more on this. Are you aware of any other websites on this subject.
    dubai mall cinema

  11. Second Innings Home is the first and only premium home & health care service in India. Second Innings Home proposed across the nation features a beautiful campus ideally located in a well-maintained gated community in the format of a Star Hotel with luxurious amenities. It’s convenient to enjoy the privacy and to be near the city and nearby facilities. And yet it retains a sense of community spirit and the warmth of a small community. Read more- good retirement homes in Hyderabad

  12. KSAC is one of the most trusted best ayurvedic medicine for piles and fissures in Hyderabad. For over two decades, we provides 100% Evidence based Treatments for diseases, naturally

  13. This is a very inspiring article. I really am truly impressed. when reading your credit report article. You offer useful information. python training in noida

  14. Tech Crunch App - We provide news from all over world. Our site keeps you updated on world latest news, Politics, top trending national news, Travel and more.