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A simple machine is a mechanical device that changes the direction or magnitude of a force. [1] In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. [2] Usually the term refers to the six classical simple machines that were defined by Renaissance scientists: [3] [4 ...
In 1951, Aetna developed the Aetna Drivotrainer, the first combination of automobile simulator and motion pictures designed for behind-the-wheel instruction in drivers' training classrooms. The Drivotrainer classroom contained 15 small single seat "Aetnacars" equipped with controls as similar as possible to those used in actual automobiles.
This system is included in the list of simple machines identified by Renaissance scientists. [10] [11] If the rope and pulley system does not dissipate or store energy, then its mechanical advantage is the number of parts of the rope that act on the load. This can be shown as follows.
Snow scenes in movies; preparing a hockey rink; driving a Zamboni machine; NASA's ice tunnel. November 21, 1999 57 "Fun In the Desert" Tyler learns how to ride a sand board and race a vehicle across dry sand. November 28, 1999 58 "Life Savers" Elisha visits a family of crash test dummies and an armored car factory. December 5, 1999 59 "Down Below"
The hand axe is the first example of a wedge, the oldest of the six classic simple machines, from which most machines are based. The second oldest simple machine was the inclined plane (ramp), [6] which has been used since prehistoric times to move heavy objects. [7] [8] The other four simple machines were invented in the ancient Near East. [9]
Screws (1 C, 63 P) Pages in category "Simple machines" The following 19 pages are in this category, out of 19 total. This list may not reflect recent changes. ...
The following outline is provided as an overview of and topical guide to machines: Machine – mechanical system that provides the useful application of power to achieve movement. A machine consists of a power source, or engine, and a mechanism or transmission for the controlled use of this power.
The 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.