By Lúa, Sara and Zacarías.

Inclined plane

An inclined plane is a straight ramp that is cut into a hillside and used for moving loads up and down the hill. Often the inclined plane was provided with cars riding on rails and pulled up and lowered down using a cable

PULLEY

A pulley is a wheel on an axle that is

designed to support movement of a

cable or belt along its circumference.[1] Pulleys are used in a variety of

ways to lift loads, apply forces, and

to transmit power.

WEDGE Perhaps the first example of a wedge is the hand axe, . A wedge is a simple machine that transforms lateral force and movement of the tool into a transverse splitting force and movement of the workpiece The available power is limited by the effort of the person using the tool, but because power is the product of force and movement, the wedge amplifies the force by reducing the movement

WHEEL AND AXLEThe simple machine called a wheel and axle refers to the assembly formed by two disks, or cylinders, of different diameters mounted so they rotate together around the same axis. Forces applied to the edges of the two disks, or cylinders, provide mechanical advantage. When used as the wheel of a cart the smaller cylinder is the axle of the wheel, but when used in a windlass, winch, and other similar applications (see medieval mining lift to left) the smaller cylinder may be separate from the axle mounted in the bearings.[7]

SCREW

A screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force.[1] It is one of the six classical simple machines. The most common form consists of a cylindrical shaft with helical grooves or ridges called threads around the outside

BIBLIOGRAPHY• http://en.wikipedia.org/wiki/Inclined_plane

• http://en.wikipedia.org/wiki/Pulley

• http://en.wikipedia.org/wiki/Wedge_(mechanical_device)

• http://en.wikipedia.org/wiki/Wheel_and_axle

• http://en.wikipedia.org/wiki/Screw_(simple_machine)

PICTURES• http://www.irc.vbschools.com/fortheweb/Science/images/SimpleMachines.jpg

•  http://upload.wikimedia.org/wikipedia/commons/thumb/9/9c/Plan_inclin%C3%A9_machine_stationnaire_Liverpool_Minard.jpg/400px-Plan_inclin%C3%A9_machine_stationnaire_Liverpool_Minard.jpg

• http://upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Crane_pulley_4x.jpg/220px-Crane_pulley_4x.jpg

• http://upload.wikimedia.org/wikipedia/commons/thumb/0/0d/Wedge-diagram.svg/100px-Wedge-diagram.svg.png

• http://upload.wikimedia.org/wikipedia/en/thumb/0/0d/Agricola1.jpg/220px-Agricola1.jpg

• http://upload.wikimedia.org/wikipedia/commons/thumb/7/7f/GearBoxRotLinScrew.gif/220px-GearBoxRotLinScrew.gif

• http://teachers.scholarschoice.ca/images/products/25/Simple-Machines-Learning-Chart-N2575_XL.jpg