ACTIVITY "INSIDE A MACHINE"

READ THESE DEFINITIONS AND WRITE THE CORRESPONDING WORDS.

1. The outer part of a machine.
2. The frame of the machine which supports the weight.
3. The components of a machine, for example, wheels,axles,etc.
4. A group of operating parts which act together to perform a specific task.
5. Engines which use chemical energy from fuel.
6. Components which have tiny electronic circuits and are used in digital cameras, telephones,etc.

MACHINES

Machines are devices which use the action of a force or convert one type of energy into another. For exemple, a bicycle is a machine which transforms human energy into mechanical energy.

Machines save us time and physical effort.

TYPES OF MACHINES

Some machines, such as pulleys, are very simple because they have very few components. Other machines, such as computers, are complex because they have many components.

Machines can be classified depending on the energy source. There are machines which work with:

-Human energy, such as a bicycle or a hammer.
-Water or wind, such as watermill or windmill.
- Fuel, such as a car or a gas stove.
-Electricity, such as a washing machine or a mobile phone.

MACHINES WHICH PRODUCE MOVEMENT

Many machines produce movement, such as escalators, cars or food blenders. These machines have a motor or an engine. The motor converts fuel or electrical energy into movement.

THERMAL MACHINES

Thermal machines, such as heaters and air conditioners, produce heat or cold.

INFORMATION-PROCESSING MACHINES

Information-processing machines are used for communication and calculations. For exemple, we can communicate with others using mobile phones, and we can make calculations on computers.

ACTIVITY MACHINES

READ THESE SENTENCES AND CORRECT THE WRONG INFORMATION.

1. A bicycle is a machine which transforms mechanical energy into human energy.
2. Pulleys have many components.
3. A hammer works with wind energy.
4. A washing machine works with fuel.
5. Computers are simple machines.