Welcome!

This is a blog of the 4th grade class in la Farigola de Vallcarca School in Barcelona. This year we are doing “Aula de Ciències” in English.
In this blog we want to show you the experiments we do in our Science Lab. Science is fun!


dimecres, 17 de novembre del 2010

Building bridges

MATERIALS:
4 thick books
1 piece of cardboard
paper clips
rubbers
INSTRUCTIONS:
Put the books in two piles about 15 cm apart.
Lay the piece of the cardboard on the books.
Put paper clips on the cardboard. Count them. The "bridge" starts to sag. Finally the bridge collapses.
Now make another bridge, but bend the piece of cardboard into an arch between the books.
Put paper clips and rubbers until it collapses.
This bridge is stronger than the first one.
WHY?
The first bridge collapses before because it is flat and it has to take all the weight.
In the second bridge the weight goes to the sides and it is shared by the books, so the card can support more weight.
WHAT DO YOU THINK ABOUT IT? WRITE YOUR COMMENTS.
Publicat per a

8 comentaris:

  1. Anna10 de gener del 2011, a les 3:37

    Hello class. The experiment is very funny because the bridges can support five rubbers and one hundred and three paper clips on the arch.
    Bye bye!

    ResponElimina
  2. Jan10 de gener del 2011, a les 3:48

    This experiment is very exciting.

    ResponElimina
  3. Christian10 de gener del 2011, a les 4:38

    My name is Christian
    BUILDInG BRIDGES is very funny!

    ResponElimina
  4. Berta10 de gener del 2011, a les 4:40

    Hello class.
    The experiment is very funny because our bridges supported five rubbers and one hundred and three paper clips.
    Bye bye class!

    ResponElimina
  5. Dani17 de gener del 2011, a les 11:19

    This experiment megacool!And very funny.

    ResponElimina
  6. Maria24 de gener del 2011, a les 8:31

    Woooow! This experiment is incredible, and very, very funny.

    ResponElimina
  7. Carmen1 de febrer del 2011, a les 5:36

    Hello class.I´m Carmen, this experiment is very interesting, because the cardboard supported many rubbers and paper clips and many pencil sharpeners!!!!!!

    Bye bye class!!!

    ResponElimina
  8. Nagore17 d’octubre del 2011, a les 11:39

    I love this experiment.It's very funny in English.

    ResponElimina

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