Machines

Machines are objects that we use to save time and energy.

There are two kinds of machines by their complexity: simples or complex.

The machines never use a person´s energy.

The machines can use wind or water energy.

Many machines use electricity or electrical current.

The most of cars need combustible fuel to work. It's the energy for them.

Wheels, pulley are complex machines.

Mechanical machines are used to lift light objects but we don't use that to produce movement.

Machines make the work harder for workers.

We can find two kinds of mechanical machines: Manual and Automatic.

Machines make our life easier in the communication.

The structure of a machine is the skeleton of the machine.

The housing doesn't protect the machine.

Automatic machines that produce movement have a motor engine.

Electrical circuits and electronic circuits direct the energy to the motor and other parts.

Sensors don't enable the machine to receive information from the outside or inside of the machine.

An antenna isn't a sensor.

Indicators and screen give us information about how the machine is functioning.

Operating parts are the moving pieces os a mechanical machine.

Wheels and axles aren't an operating parts.

Gears don't need teeth or cogs to transmit movement.

Machines can do the work of more than one person at once.

Modern transportation allows us to travel far away.

The combustible fossil in different types of transportation is perfect for the environment.

Machines haven't done advances in health.