# 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 ?
compound machine--a device in which two or more simple machines work together
A close up of a Kilobot swarm, obedient miniature robots that act together as a "swarm" to form a 1,000-strong army, scientists in the US cre-|ated the soldier-like devices to demonstrate how simple machines can display complex self-organising behaviour.
Everything you need to lead Confetti Launcher is in the Parents and Educators section of the website's Simple Machines topic area.
It was a serious engineering challenge using simple machines.
The list guides Tom through an exploration that will get him on track to connect the task (crushing) to a simple machine.
Simple machines use physical laws to make work easier--for instance, allowing you to move a much heavier weight than you could alone.
They used ordinary materials such as tires, wooden ramps, buckets, and kettles in a large warehouse space, and brought to life many aspects of mechanical and chemical engineering from simple machines to projectiles and combustion.
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.
With research consistently showing that students can be motivated to learn with ICT, this case study sought to investigate Year 7 students' learning about simple machines in an ICT-enhanced environment where they could self-direct their own learning with minimal intervention from the teacher.
While working in teams of two or three with Early Simple Machines Set 111, elementary students can explore energy, buoyancy and balance by manipulating simple models of seesaws, rolling vehicles, spinning tops and rafts.
The 12 titles cover a range of topics from data and inquiry to seasons to work and simple machines.