EXERCISES:

Page 92, exercises 1-2

1.Copy and complete the following table:

Type of structures	Examples
Mass	Walls, dams, etc.
Frame structures	Building
Truss Structures	Electricity pylons
Suspended stuctures	Bridges, marquees, etc.

 
2.Have you seen a structure that uses cables? Write down the names of ones that you can remember or the ones that you can see.


Electricity pylons

Page 93, exercises 3-6

3. When a person  sits on a chair, the stress that the chair has to withstand is due to the weight of the person, whereas the strength is the chair's ability to withstand the load without breaking. Indicate which is the strength and which is the stress in these two examples:

    A) A wardrobe hanting from a rope: Bending.

    B) A twisting telephone cord: Torsion.

6. Describe the structure of a turtle's shell. Why do you think it has this shape? What material do you think it is made from? Is it strong enough for the stresses it has to withstand?

The shell it's like an oval.
I thing that it is made of  a type of bone, an external eskeleton.

Yes I think it is cuse it has to withstand the turtle body.

7. Which types of stress do the following elements and activities have to support: 1) a rope with a weight hanting off it, 2) a man pushing a cabinet, 3) tightening a screw, 4) cutting our fingernails.

1) Bending

2) Compression

3) Tension

4) Shear

 9. Write s short description of three objects using one of the following adjectives for each object: rigid, elastic and plastic. Explain how these properties allow the objects to fulfil their function or make them suitable for yheir purpose.

Rigid: does not deform.

Elastic: deforms but then returns to its original shape.

Plastic: deforms and stays deformed.

Page 95, exercises 11-12

11. Copy and complete the following table in your notebook with objects that have the properties shown in the right-hand columm.

Object	Properties
Brick	Rigid
Plastic	Deformable
Rubber	Elastic
Plasticine	Plastic

12. Think about the following objects and state whether they are rigid, plastic or elastic: balloon, empty drinks can, window frame, clay, catapult, door.

Rigid: Door, Catapult.

Plastic: Balloon, Windows frame, Empty drinks can.

Elastic:  Balloon, Clay.

Comprehesion Activities

• Explain what is a website and give three examples:                                                               A website is a series of web pages linked each other that can  be accesed from a common adress.  For example:

1. Define the following concepts: static page and dynamic web page . Explain what language each one uses:                                                                                                        

 Static web page are pages that do not change , thet always shows the same contens . Example schools web  pages are always the same  they just upload more info but it could be once a year.

Dynamic web page are pages that constantly changing and change a lot .Example Google facebook twitter... 

     2. What extension is used by the files to make up a website?
To make up a website we use HTML



         

THE CLOUD BUTTERFLY

Tinkercad

At firsts we did a diagram and three views an in tinkercard we dise4gned it with a 3d views

You can do it  with Tinkercad and you can printer with a 3D printer.

Structures:
Mass:
A mass structure is a structure that is made by combining similar materials into a certain shape or design. Mountains are an example of a natural mass structure, and brick walls are an example of a man-made mass structure.
Frame:
Frame structures are the structures having the combination of beam, column and slab to resist the lateral and gravity loads. These structures are usually used to overcome the large moments developing due to the applied loading.
Truss: 
These structures are composed of bars that form triangles. They are lightweight and sturdy. Examples include cranes, electricity pylons, etc.
Suspended: 
These are held in place by cables and suspended attached to study supports , Examples include suspension bridges, tents, marquees, etc.