FTALETES

Hi! This week we have seen a video and now I will answer you some common questions to understand more the unit.

1. What are fataletes? 

Phtaletes are addictives used in everyday plastics products to increase their flexibility, durability and transparency.
2. Where can we found them? 


We can found it in plastic's babies toys, beverage containers, food wraps..

3. Are they dangerous? Why?

Yes, a lot, because they're so easly taken into ours bodies. They can be absorbed by skin contact, ingested and inhaled. They can also produce cancer and birth defects.

4. What are this two young scientifics tying to do? 

They are searching some way to try to dissolve plastics in a quicker way by using phtalates.

5. Give your opinion about their work and archievements.

I think that if everybody stopped to think one second in what the plastics that they use every day are producing to our world, it will change a lot. I also think that the work and the hours that this women had dedicated to this project are so important and that this project will change our world to better.

6. What is an accident? Is always a bad think? Give examples.

An accident is something that happens without a purpose, but is not always bad, for example when Alexander Fleming discovered the penicillin.

MEHANISMS!

Hi! This weeks we have been working in mechanisms  at the TECHNOLOGY classes, and now  I will explain all my knowledge about this first unit.

I have decided to do it in a kind of squeme to make it more visual and easy to study.

      MECHANISMS:  The mechanisms are simply objects that take a concrete force or motion to transform it to a different force or motion.

The mechanisms are used to make easier a job.

There are so different types of mechanisms, this are the more used in the mechanisms systems:

GEARS: are wheels with teeth that can either increase the speed of a machine or its force, but not both at the same time. We use them to increase the force, to increase the speed or to change the direction.   Ex: a bicycle

.

 There are different types of gears depending the use (rotary, speed...)

• Gears Trains (Rotary motion)
• Rack and Pinion (Type of motion)
• Bevel Gears (Direction of motion)

GEARS TRAINS

RACK AND PINION

    BEVEL GEARS

• CAMS: A cam is a shaped piece of metal or plastic fixed to a rotating shaft. It have different parts: 

EXAMPLE

     And there are different types of cams:

• Circular cam 
• Pear cam
• Snail cam
• Four-lobed cam.

• PULLEYS: Pulleys are used to change the speed, direction of rotation, or turning force or torque. A pulley system consists of two pulley wheels each on a shaft, connected by a belt.

                             

 If the pulley wheels are different sizes, the smaller one will spin faster than the larger one. The difference in speed is called the velocity ratio. 

MACHINES: Are objects that make it easier to people to do a work. 

This are the six main types of simple machines:

• LEVERS: It is the simplest machine of all. It is a simply bar that helps us to exert a bigger force when you turn it. 

          Like you can see in the image below it is divided into three main parts: the fulcrum, the effort             and the load

        Different types of levers:

• Class-1 levers: Is when the force you apply is in the opposite side of the fulcrum of the force you produce. Ex: sccisors
•  
• Class-2 levers: This type of lever is putted in an other way: with the fulcrum at the end, the force you produce at the middle and the force you apply at the beggining.                Ex: wheelbarrow. 
• Class-3 levers: It is different again, in this case we found the fulcrum ata the end and the two forces switch around. Ex: tongs
•  

• INCLINED PLANE : An inclined plane is a ramp that assists moving an object up and down heights. This is a plane surface, set at an angle against a orizontal surface. 

          It works because the greater the distance the smaller the force applied. EX: stairs.

• SCREW: It is a machine that converts rational movement into linear movement. The  closer and wider the thereda are (the main part of a screw) stronger will be the hold. It is use to:
• Drill holes 
• Hold things together
• Lift heavy objects.

EX: bulb

• PULLEY: A basic pulley comprises of a wheel on a fixed axle, with a groove along the edges to guide a rope. Each time the rope wraps around the wheels, you create more lifting power or mechanical advantage. EX: Crane
• 

• WHEEL AND AXEL: Is a simple machine used to move heavy objects in an easiest way. In this simple machine, a wheel is locked to a central axle and they rotate each other when a force is applied on  either one of them. Is one of the more used machines.  EX: wheel 

• WEDGE: A wedge is made up of two inclined planes, that meet and form a sharp edge. They don't work without movement. EX: knife, saw...
• 

TRANSMISSION OF MOVEMENT:

Rotary motion is turning round in a circle, such as a wheel turning.

• Linear motion is moving in a straight line, such as on a paper trimmer.
• Reciprocating motion is moving backwards and forwards in a straight line, as in cutting with a saw.
• Oscillating motion is swinging from side to side, like a pendulum in a clock.

Here you have a mindmap of all the unit:

Personal interests: like I had said in other posts I love dance, and I constantly use gears (the ones that are inside the music tower) and wheels and axels (the ones that are used to move the bar). 

This are the pages where I had found all the information:
http://www.explainthatstuff.com/toolsmachines.html
http://www.bbc.co.uk/schools/gcsebitesize/design/systemscontrol/mechanismsrev8.shtml
https://youtu.be/UtfVZtuyuHU
http://aulavirtual.caib.es/c07006305/pluginfile.php/9582/mod_resource/content/1/SCAN-348.pdf
ALL FOTOS: GOOGLE IMAGES.