UNIT 3. MATERIALS. VOCABULARY

A

Ash

Aluminium

Ash

B

Birch

B eech

Branch

Bark

Broadleaf

Bronze

C

Chesnut

Copper

Cotton

Cork

D

Deciduous tree

E

Elm

Evergreen tree

F

Fir

G

Growth  rings

Gold

Glass

H

Heartwood

Hardwood

I

Iron

L

Leaf

Leaves

Leather

M

Metal

N

Needle

O

Oak

P

Pine

Poplar

Petroleum

Plastic

R

Roots 

Rubber

S

Stem

Seed

Steel

Sapwood

Softwood

Sap

Silver

Stone

Silk

T

Timber

Tree

Trunk

W

Wood

Wooden

Walnut

Wool

PROPERTIES OF MATERIALS

PROPERTIES OF MATERIALS

STRENGTH

The ability of a material to stand up to forces being applied without it bending,  breaking, shattering or deforming in any way. ELASTICITY The ability of a material to absorb force and flex in different directions,  returning to its original position. PLASTICITY The ability of a material to be change in shape permanently.  DUCTILITY The ability of a material to change shape (deform) usually by  stretching along its length. TENSILE STRENGTH The ability of a material to stretch without breaking or snapping. MALLEABILITY The ability of a material to be reshaped in all directions without cracking TOUGHNESS A characteristic of a material that does not break or shatter when receiving a blow or under a sudden shock. HARDNESS The ability of a material to resist scratching, wear and tear and indentation. CONDUCTIVITY The ability of a material to conduct electricity.

KINDS OF MEMORY IN COMPUTER

In computing, memory refers to the physical devices used to store programs  or data  on a temporary or permanent basis for use in a computer or other digital electronic device.

TYPES:

- RAM (RANDOM ACCESS MEMORY): Volatile memory is computer memory that requires power to maintain the stored information.
- ROM (READ ONLY MEMORY): Non-volatile memory is computer memory that can retain the stored information even when not powered. New contents can not be added. Used to store the instruction of routine type, permanent in nature and used to control or supervise the hardware.

COMPUTER´S VOCABULARY

1. Address	14.Dot	27.Memory	40.Spam
2.Address book	Download	Menu	Toolbar
3. Addressee	Email	Message	USB
4.Attach	Email Address	Network	User name
5.Backup	Erase, Delete	Password	Virus
6.Bandwidth	File	Print	Web page
7.Browser	Folder	Program	Website
8.Button	Home page	Save	Window
9.Click	Icon	Screensaver	48.Wireless
10.Cursor	Install	Search engine
11. Cut and paste	Key	Slash
12. Data	Keyword	Server
13.Desktop	26.Link	39.Software

1. TRANSLATE  INTO SPANISH

THE BINARY NUMBERING SYSTEM

Computers use binary code. This is based on the binary numbering system that uses the digits 0 and 1 to represent any character or number. The value of these digits depends on their position in the group. In the binary code the value is determined by a base-2 system.

To convert a binary number into a decimal number:

1. Find the successive powers of 2, starting with 2^0, followed by 2^1, 2^2, etc.
2. Multiply by either the 1 or 0  the relation to that position.

To convert a decimal number into a binary number:

1. Divide the decimal number by 2 successively until the quotient is 1.
2. Put the remainders of the quotient in order from right to left.