simple machine - any of the basic mechanical devices for applying a force, such as an inclined plane, wedge, or lever, force - strength or energy as an attribute of physical action or movement., lever - a rigid bar resting on a pivot, used to help move a heavy or firmly fixed load, wedge - driven between two objects or parts of an object to secure or separate them., pulley - a wheel with a grooved rim around which a cord passes. It acts to change the direction of a force applied to the cord and is chiefly used (typically in combination) to raise heavy weights., inclined plane - a plane inclined at an angle to the horizontal., wheel and axle - a simple lifting machine consisting of a rope which unwinds from a wheel on to a cylindrical drum or shaft joined to the wheel to provide mechanical advantage., screw - a short, slender, sharp-pointed metal pin with a raised helical thread running around it and a slotted head, used to join things together by being rotated so that it pierces wood or other material and is held tightly in place., scissors - an instrument used for cutting cloth, paper, and other thin material, consisting of two blades laid one on top of the other and fastened in the middle so as to allow them to be opened and closed by a thumb and finger inserted through rings on the end of their handles, shovel - a tool with a broad flat blade and typically upturned sides, used for moving coal, earth, snow or other material,

simple machines

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