Q:

Why do people use machines?

A:

Quick Answer

Human beings use machines to save time and increase productivity when doing work. Machines are used to lift and move heavy objects and to reduce the amount of effort and energy people use in working. Machines also eliminate some of the risks involved in workplaces.

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Full Answer

People use two types of machines: simple machines and compound machines. Types of simple machines include ramps, wedges, pulleys, gears, levers, inclined planes and hydraulic systems. Compound machines are machines that have two or more simple machines to function effectively. Examples include bicycles, cranes and bulldozers. Machines are used in simple tasks such as hitting a nail and in heavy tasks such as moving heavy metal and soil.

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Related Questions

  • Q:

    Who invented simple machines?

    A:

    The Greek philosopher Archimedes is credited with inventing the idea of simple machines. Even though Archimedes improved on already existing ideas from unknown people, it is he who discovered the mechanical advantages of levers that people were already using to pull, push and lift items by hand.

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  • Q:

    What two simple machines make up scissors?

    A:

    Compound machines are systems that incorporate two or more simple machines into their design. A pair of scissors is a compound machine that incorporates both the lever and the wedge into its design.

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  • Q:

    Who first used a graph to convey information?

    A:

    Although William Playfair is often credited with having created the first bar graph around 1780, Nicole Oresme used a graph-like planar illustration in a 14th-century work to demonstrate the acceleration of an object over time. Because of similarities in Oresme's illustration to modern bar charts, his usage can be considered a forerunner of the current method of using visual elements to display numerical information. Joseph Priestly, another early proponent of using visual images to convey numerical concepts, published a timeline type of graph in 1765 that incorporated bars of varying lengths.

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  • Q:

    Who invented porcelain?

    A:

    Porcelain was invented by the Chinese sometime during the Tang Dynasty, which lasted from 617 to 907 A.D. However, they had been making ceramics and proto-porcelain materials for as many as 1,000 years before this time.

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