UNIT 11. TOOLS AND MACHINES (3º E.P.)

UNIT 11. TOOLS AND MACHINES

TOOLS AND MACHINES

Tools and machines are things that make our life easier.

A machines is a group of parts that use energy to carry out a task. There are two types of machines:

- Simple machines: For example, the lever. It has two parts: an arm and a head. We use a lever to lift an object suppoted on the head using the energy of the arm.

- Complex machines: For example, a motor (it uses electricity or petrol).

TOOLS AND MACHINES FOR WORK

We need tolos and machines because theypermit us to do jobs quickly, easily and safely. For example today in agriculture we use tractors and in the past farmers worked with their hands. In building, now we lift weights using cranes but in the past, people did it by hand.

TOOLS FOR COMMUNICATION AND HAVING FUN

·         Communication

-          The radio: produces sound.

-          The television: produces moving pictures and sounds.

-          The telephone: permits us to talk over long distances. There are fixed telephones and mobile phones.

-          The internet and computers: permits us to receive different types of information.

·         Having fun

-          To create art: to take photos, to make films, record music..

-          To play sports: footballs, basketballs, racing cars…

-          Top lay: electronical toys

-          To entertain and inform: computer, radios, MP3…