dimarts, 22 de novembre del 2016

PHTHALATES AND ACCIDENTS

1. What are phthalates?

Phthalates are esters of phthalic acid and are mainly used as plasticizers (substances added to plastics to increase their flexibility, transparency, durability and longevity).

2. Where can we find them?

We can find them in products that we have a high exposure. For example, in baby's toys, beverage containers, cosmetics and food wrappers.

3. Are they dangerous? Why?

Yes, they are dangerous, Because they pollute our environment and our bodies. Moreover, phthalates are horrible because they are so easily taken into our bodies. They can be absorbed by skin contacts. It has been shown that it can cause cancer

4. What are the two young scientists trying to do?

They try to explain us about the phthalates and accidents. They explain why are they dangerous, a new discovery that could destroy phthalates, what are they etc.

5. Give your opinion about their work and their achievements.

I think that they are explaining us and doing a very useful work. Until now, I didn't know what were phthalates and thanks to them now I know it. I think that they did a great job because now people can know how to avoid them.

6. What is an accident? Is always a bad thing? Give some examples of positive results from accidents.

An accident is an incidental and unplanned event. No, accidents aren't always a bad thing they can also be a positive thing. Thanks to the accidents people has discovered very important things. For example, the discovery of the penicillin is one of the most fortunate accidents of all time. Without it, we wouldn't be able to fight against many bacterial infections.

INFORMATION: https://www.youtube.com/watch?v=ay-y3tSYGYw

dimarts, 8 de novembre del 2016

MY KNOWLEDGE ABOUT MECHANISMS

What are simple machines?
A simple machine is a mechanical device that changes the direction or magnitude of a force.
In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force.

Usually the term refers to the 6 classical simple machines:

-Lever: is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. A lever is a rigid body capable of rotating on a point on itself. A lever amplifies an input force to provide a greater output force, which provide leverage. 

             
   

-Wheel and axle: consists of a wheel attached to a smaller axle so that these 2 parts rotate together in which a force is transferred from one to another.

    
       
                                                    


-Pulley: is a wheel on an axle that is designed to support movement and change of direction of a taught cable, rope or belt along its circumference.

       
                                                   
-Inclined plane: is a flat supporting surface tilted at an angle. Used to move heavy loads over vertical obstacles.

           
                                                     

-Wedge: a piece of hard material with two principal faces.
           
                                                         

-Screw: type of fastener, is an inclined plane wrapped around a nail.




USES OF SIMPLE MACHINES IN OUR DAILY LIFE:
We use machines every day. Machines help our lives get easier.
The simple machine that I use the most, in my daily life, is the wheel and axle. I use it to open de doors, to ride my bike etc.
They help us to use smaller force to do hard and complex jobs.


TRANSMISSION OF MOVEMENT
All mechanical systems have mechanisms which transform an input into an output motion. They make something easier to do.
Some mechanisms change one type of motion into another.
 Types of motion:

-Linear motion: moving one way in a straight line. Example: a moving car.

 





-Reciprocating motion: moving backwards and forwards in a straight line. Example: the up and down motion of a yo-yo.


-Oscillating motion: moving backwards and forwards in an arc. Example: a swing.

-Rotary motion: moving in a circle. Example: a wheel.


MECHANISMS
A mechanism is a simply device designed to transform input forces and movement into a set of output forces and the movement. The mechanisms most commonly used in mechanical systems are levers, linkages, cams, gears and pulleys.

TYPES OF MECHANISMS:

-Mechanical linkage: is an assembly of bodies connected to manage forces and movement. The link is considered to be rigid.



-Cam: rotating piece in a mechanical linkage used in tranforming rotary motion into linear motion or vice versa.
 It has 2 main parts: the cam and the follower.
 Cams come in many different shapes and sizes. The follower rests on the cam and follows its shape. It may have a small wheel to reduce friction. The follower moves up and down as the cam turns. Cam shapes: circular, pear, snail, four-lobed cam...                                      
       

-Gears: toothed wheels that interlock. A gear train is where 2 or more gears are linked together. Gears can change the type of motion or the direction of motion. Example: worm drive and worm wheel, bevel gears, rack and pinion...










Examples of them in our daily life:
-Rack and pinion gears are often used on railways.
-Worm drives are used for tightening guitar strings.

MINDMAP:

https://www.mindomo.com/mindmap/b8aaea4a849f4863a3a7fe078e4c0d6d



PERSONAL INTEREST:

I love playing the guitar. The guitar is my favourite instrument, when I can I always play it because I love music. One mechanism, helps me to tighten the guitar, which is called the worm drive and it's a type of gear.



SOURCES OF INFORMATION:
https://www.google.de/search?q=guitar&biw=1024&bih=613&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiW_u3415nQAhWQ2YMKHcQOCAIQ_AUIBigB#tbm=isch&q=worm+gear+guitar

https://en.wikipedia.org/wiki/Simple_machine

http://aulavirtual.caib.es/c07006305/pluginfile.php/9582/mod_resource/content/1/SCAN-348.pdf

https://en.wikipedia.org/wiki/Mechanism_(engineering)

All the photos: Google Images

divendres, 7 d’octubre del 2016


PRESENTATION

Hello! My name is Angela Galmes and this is my blog! :)
 I'm a 3 of ESO student and this blog is a project of technology where I will explain things about me, tasks of technology etc.
I have 13 years old and I'm from Mallorca. My goal in my life is travel around the world!

My first powtoon:

https://www.powtoon.com/online-presentation/fk9QFxqGCnW/technology-my-first-powtoon/?mode=movie#/

My opinion:
Powtoon is a very usefull way to make a video, you can decorate it the way you want and make whatever you want to  do in your video. You can use it to make projects, presentations etc.
The only problem I had, was with the sound. Because if you make a large video it's difficult to find one that you like.
Apart from that, I really like it!