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Wednesday

Wednesday, 3rd June 2020

Design and Technology

 

Hi children,

 

In store today... investigate which shape is the strongest, investigate how to make paper stronger and try out ideas for bridge designs

 

LO: To investigate which shapes are the strongest

       To learn how to strengthen, stiffen and re-inforce structures

 

On Monday I left you a list of materials you would need today. Hopefully you will have them ready to use...if not don’t worry as you will probably have the things you need at home anyway.

 

You are going to do 3 activities (or more if you like).

 

Activity 1 : Choose one of these (A, B, C or D)

1. You are going to make one triangle and one square using the materials below. Here is a photo to show you what your triangle and square should look like.

Picture 1

Here are the materials you would need for each activity:

 

A cardboard strips (e.g. old cereal packets) and paper fasteners or wire ties or pipe cleaners or garden twine or wool

          B dried spaghetti (uncooked) and marshmallows

          C cocktail sticks and jelly sweets or blutack or plasticine

          D paper straws and pipe cleaners or wire ties 

 

2. When you have made your shapes press on each corner. How strong is the shape? (If the sides collapse it is not so strong).

 

3. Hopefully you have found out that the triangle keeps its shape best so it is the strongest shape.

 

Activities 2 and 3: Choose 2 of these (A, B, C, D)

 

Task A

You need:

2 chairs (seat end to seat end) with a gap of 20 cm between them

Paper/scrap paper about 60 cm in length (I used 2 A4 sheets stuck together longways)

2 piles of quite heavy books

Coins or unbreakable heavier objects (e.g. small books, building blocks)

  • Make a beam bridge using the flat paper and stacks of books as abutments at each side.
  • Test how strong it is with coins or unbreakable small, heavier objects.
  • Now concertina the paper (like if you make a fan. Use the paper long ways) and repeat the investigation.

Which bridge was stronger?

 

Task B

You need:

2 chairs (seat end to seat end) with a gap of 20 cm between them

About 10 sheets of newspaper opened out

Masking tape or sellotape

2 piles of quite heavy books

Coins or unbreakable heavier objects (e.g. small books, building blocks)

 

  • First make a beam bridge using the newspaper sheets flat and stacks of books as abutments at each side.
  • Test how strong it is with coins or unbreakable small, heavier objects.
  • Now roll the newspaper longways and use masking tape/sellotape to stop it from unrolling. Put each end under each pile of books. Test it like before.

When was it stronger?

 

Task C

You need:

2 chairs (seat end to seat end) with a gap of 20 cm between them

strong cardboard perhaps from old packaging

2 piles of quite heavy books

Coins or unbreakable heavier objects (e.g. small books, building blocks)

  • First make a beam bridge using the cardboard and stacks of books as abutments at each side.
  • Test how strong it is with coins or unbreakable small, heavier objects.
  • Next make an arch bridge using the cardboard and stacks of books as abutments at each side.
  • Test how strong it is with coins or unbreakable small, heavier objects. (I used bananas to hug the curve! Then I ate one!!)

Which was stronger – the arch bridge or the beam bridge?

 

Task D

Use lego or other construction toys to make a bridge – it could be any of the types we have been looking at or you might design one of your own.

 

What have you learnt?

Triangles are a strong shape.

Paper can be strengthened by layering it, rolling it and concertina-ing it.

Arch bridges can be stronger that beam bridges.

How to use construction toys to make bridges and take loads.

 

We would love to see photos of you making and testing your bridges and if we upload them all your friends can see them too! Please email your photos to me at

j.dewaele@stmichaels-pelsall.co.uk

 

What’s coming up next time?

Next Monday we’re going to be designing bridges and on Wednesday we’re going to be making them. With this in mind here is a copy of your task so you can start to think about it.

Have a great afternoon children... I’m going off to eat marshmallows and jellies now – how about you?

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