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Simple Machines

Introduction to six different devices that make work easier by changing a force.

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The Amazing Wheel

The Amazing Wheel

Credit: Carlo Lasinio (Engraver), Giuseppe Angelelli , Salvador Cherubini, Gaetano Rosellini (Artists), Ippolito Rosellini (Author)
Source: http://commons.wikimedia.org/wiki/File:Egyptian_Chariot_(colour).jpg
License: CC BY-NC 3.0

This colorful image shows an ancient Egyptian chariot. The chariot was a two-wheeled vehicle pulled by a horse. The wheel was invented thousands of years ago, probably more than once. It’s been called one of the most important inventions of all time. Do you know why?

The Back Story

  • A wheel actually consists of two concentric wheels, one inside the other. The inner wheel is called the axle, and the outer wheel is called the wheel.
  • You might think that the wheel was invented for transportation, but the earliest wheels were probably used for other purposes.
  • Credit: Emran Kassim
    Source: http://www.flickr.com/photos/emrank/3142426851/
    License: CC BY-NC 3.0

    Modern wheels are also used for purposes other than transportation [Figure2]

  • Learn more about the history of the wheel by watching this short video:


What Do You Think?

At the links below, further explore the wheel and its history. Then answer the questions that follow.

  1. Describe a wheel and axle. What is the general purpose of a wheel and axle?
  2. The earliest known wheel and axle wasn’t used for transport. When, where, and how was it used?
  3. When and where was the wheel and axle first used for transport?
  4. Explain how a wheel and axle can increase either force or the distance over which force is applied.
  5. List some of the many uses of the wheel and axle.
  6. What do you think? Do you consider the wheel and axle to be one of the most important inventions of all time? Why or why not?

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Image Attributions

  1. [1]^ Credit: Carlo Lasinio (Engraver), Giuseppe Angelelli , Salvador Cherubini, Gaetano Rosellini (Artists), Ippolito Rosellini (Author); Source: http://commons.wikimedia.org/wiki/File:Egyptian_Chariot_(colour).jpg; License: CC BY-NC 3.0
  2. [2]^ Credit: Emran Kassim; Source: http://www.flickr.com/photos/emrank/3142426851/; License: CC BY-NC 3.0

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