Las+máquinas

MACHINES LAS MÁQUINAS

Las máquinas son instrumentos fabricados por el hombre y que nos AHORRAN TIEMPO y ESFUERZO a la hora de hacer tareas.

A __machine__ is an instrument that makes work easier.

Las máquinas necesitan ENERGÍA para funcionar. Machines need __energy__ to work. Some machines use __human__ or __animal__ energy. Some machines use __electrical__ energy. Many machines use __fuel__, like petrol and diesel. We also use __renewable energy sources__ like the Sun, the wind and water. These sources of energy don't run out and they produce very little contamination.

Las máquinas pueden ser: SIMPLES y COMPUESTAS. Types of machines

Machines can be __simple__ or __complex__ (or compound).Simple machines have only one or two parts. They are often called //tools//.

 Complex or compound machines have many parts. They can be a combination of different machines.



ACTIVITIES Think!
 * 1) How many machines do you know?
 * 2) Are they simple of complex?
 * 3) What type of energy do they need to work?

A __bicycle__ is a machine. It is a __complex__ machine. It uses __human energy__ to work. <span style="color: #00ffff; display: block; font-family: 'comic sans ms',cursive; font-size: 200%; text-align: right;">By Gracia P.F.