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    Home » Primary Science » Key Stage 1 Science » Stability of Structures

    Stability of Structures

    March 19, 2012 By Emma Vanstone 9 Comments

    I wanted to get my children thinking about the process of investigation today, so we talked about how we could test whether some structures were stronger than others using DUPLO. They decided to build three different shaped towers and test them by rolling a ball at them.

     

    The first is a simple tower, the second has 4 legs and the third is a solid structure. You can see that each tower is the same height. Z rolled the ball at each quite forcefully, the first two toppled immediately while the solid one stayed standing.

    We decided that there were some faults with our investigation. Z had basically kicked the ball each time, but we didn’t know if some of the kicks were harder than others. I helped them out a bit and we decided we needed as much as possible to stay the same.  We talked about how the speed at which the ball hit the towers and the direction at which it hit them might be important so we decided to try and control these.

    To really try and keep our variables constant I used a dolls highchair to string up a weight like a pendulum. To make sure the same hit happened each time we held up the lemon ( our weight ) to 90 degrees and dropped towards the towers from there.

    We built the following towers and tested them one at a time, counting the number of pendulum swings it took to make the towers collapse.

    1 column of bricks

    2 columns of bricks joined only at the top

    2 columns of bricks joined throughout the structure

    2 columns end on

    4 columns

    Super special tower

     

     It was very evident that the less structure there was there the more unstable the tower.  A single tower collapsed within a single swing of the lemon.   The double sized tower took two swings, in either orientation.  When reinforced all the way through it still only lasted 2 swings.  The Quadruple tower lasted 6 swings.

    We also then started talking about making things stronger without using as many bricks, perhaps even leaving gaps like a building has for floors.  However the smashing fever had set in and we think we may leave this subject for later exploration 🙂

    Our special tower was within the limits of our investigation, indestructible.

     

    The Science bit

    When carrying out a scientific investigation you should reduce the number of variables to as few as possible. Ideally the factor you are investigating should be the only variable, everything else should be constant.

     

    Structures

    Last Updated on January 19, 2015 by Emma Vanstone

    « Marshmallow Towers – Engineering Challenge
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    Safety Notice

    Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

    These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

    Reader Interactions

    Comments

    1. Crisc

      March 19, 2012 at 10:44 am

      I have a science project with my son coming up..we are doing it on the earthquake proof buildings. I wasnt sure how to make the buildings with legos but your post helps so much! Would you mine if I used some of your ideas and cited you on his Science Project? Thanks, I found you on pinterest =)

      Reply
      • ScienceSparks

        March 19, 2012 at 12:21 pm

        That is fine with us. I’m so glad we were helpful! x

        Reply
    2. Shiloh

      March 19, 2012 at 6:38 pm

      I don’t think you can get a project any more fun than smashing things! What a great learning idea!

      Reply
    3. Justine

      March 21, 2012 at 4:13 pm

      Stopping by from Take A Look Tuesday! http://queenofsavings.com

      Reply
    4. maggy, red ted art

      March 21, 2012 at 5:31 pm

      Oooh what a bit of Lego sciency fun!! Brilliant!!

      Thanks for sharing on Kids Get Crafty!

      Maggy

      Reply
    5. Rebekah @ The Golden Gleam

      March 23, 2012 at 2:43 am

      Kids just love to knock down towers, so this is such a fun way to incorporate science into play! I am pinning this activity.

      Reply
    6. [email protected]

      March 23, 2012 at 6:44 pm

      Oh, my kids would love this! Knocking down block towers is their specialty lol. Thanks so much for sharing with Tuesday Tots!

      Reply
      • ScienceSparks

        March 24, 2012 at 9:55 pm

        Yay, glad you like it. x

        Reply
      • ScienceSparks

        March 24, 2012 at 9:57 pm

        Thanks for having us!

        Reply

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