# simple machine

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## simple machine

[′sim·pəl mə′shēn]
(mechanical engineering)
Any of several elementary machines, one or more being incorporated in every mechanical machine; usually, only the lever, wheel and axle, pulley (or block and tackle), inclined plane, and screw are included, although the gear drive and hydraulic press may also be considered simple machines.

## Simple machine

Any of several elementary machines, one or more of which is found in practically every machine. The group of simple machines usually includes only the lever, wheel and axle, pulley (or block and tackle), inclined plane, wedge, and screw. However, the gear drive and hydraulic press may also be considered as simple machines. The principles of operation and typical applications of simple machines depend on several closely related concepts. See Efficiency, Friction, Mechanical advantage

Two conditions for static equilibrium are used in analyzing the action of a simple machine. The first condition is that the sum of forces in any direction through their common point of action is zero. The second condition is that the summation of torques about a common axis of rotation is zero. Corresponding to these two conditions are two ways of measuring work. In machines with translation, work is the product of force and distance. In machines with rotation, work is the product of torque and angle of rotation. See Hydraulic press, Wedge

References in periodicals archive ?
It was a serious engineering challenge using simple machines.
Simple machines use physical laws to make work easier--for instance, allowing you to move a much heavier weight than you could alone.
Children entering kindergarten through fifth grade will participate in labs in the areas of light, sound, simple machines, chemical reactions and liquids, gases and solids.
While working in teams of two or three with Early Simple Machines Set III, elementary students can exploreenergy, buoyancy and balance by manipulating simple models of seesaws, rolling vehicles, spinning tops and rafts, and by using wheels, axles, pulleys, levers and gears.
Players use the Touch Screen and stylus to draw geometric shapes-including lines, circles, boxes, triangles and pivot points-to create simple machines that help Marker Man advance through levels from point A to point B.
Accordingly, the book follows the history of the treatments of these objects in early modern mechanical theories, starting with Guidobaldo del Monte, who revived Heron's and Pappus's program of reducing all machines to a number of simple machines, up to Newton's Principia documenting the beginning of a new era in which an object-centered approach gave way to a principle-centered approach.
Some machines may seem really complicated, but most are made up of simple machines like ramps, pulleys and levers.
A few alleys down from Jabr's bathhouse another doorway opens into a vaulted chamber, its dry central fountain now surrounded by a handful of simple machines, all of them idle.
Grades 3-4 will appreciate Robert Gardner's SENSATIONAL SCIENCE PROJECTS WITH SIMPLE MACHINES (0766025853, \$23.
of Bath) examines the complex relationships amongst technology, knowledge, nature and truth, including Bhaskar's argument, Galileo's mathematical projection of the six simple machines and the mechanical world-view, the role of mathematics in building metaphysics, the influence of the art of experimentation, and the will to build machines and thought systems.
It coincided with human migration around the globe, the production of implements from multiple materials, and the building of simple machines.
This means they are made of two or more simple machines working together.

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