THE PULLEY They are used to raise or lower heavy loads with less effort.
Gears with chain: are two wheels or more cogs joined by a chain of links.
The connecting rod is a rigid rod that is connected to a rotating body.
TEXTILE MATERIALS Natural: whether obtained from wool, silk, linen, cotton Synthetic: obtained by chemical or industrial processes from other products Used in the form of yarns for making fabrics
METALLIC MATERIALS They are extracted from the minerals of the rocks. Ferrous materials. They contain iron, such as steel and foundries. Non-ferrous materials. They do not contain iron, such as copper, bronze, zinc brass, aluminum
CERAMIC MATERIALS They are obtained by molding clay and then subjecting it to a cooking process in an oven Example: a brick, a tile, a bottle, a dish, a sink, etc.
PLASTIC MATERIALS Obtained from petroleum, coal, vegetable matter, and natural proteins Used to make pipes, packaging, toys, containers, etc.
THE WOODS They are obtained from the woody part of the trees They are classified in hard and soft, according to the type of tree It is used for: fuel, manufacture paper, furniture, construction, etc