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Types of Simple Machines

fundamental forces of nature, electromagnetic theory, repulsive force, Magnetic forces, magnetic materials

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>  Inclined Plane

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>  Wheel and Axle

The wheel and axle is similar in appearance to a pulley, with one major difference: the wheel is fixed to the axle, as is the steering wheel of a car. A user applies effort to the large outer wheel of the steering wheel to move the load at the axle. The MA of a wheel and axle is equal to the radius of the wheel divided by the radius of the axle. The radius of the wheel, and therefore its circumference, is usually much larger than the radius of the axle. Therefore, the distance over which the effort is applied is much greater than the distance the load, which is placed at the axle, moves. The difference in the sizes of the wheel and axle can result in a large mechanical advantage. Some common examples of a wheel and axle are a doorknob and a round water faucet handle.

Pulley

Magnetism, an aspect of electromagnetism, one of the fundamental forces of nature. Magnetic forces are produced by the motion of charged particles such as electrons, indicating the close relationship between electricity and magnetism. The unifying frame for these two forces is called electromagnetic theory. The most familiar evidence of magnetism is the attractive or repulsive force observed to act between magnetic materials such as iron. More subtle effects of magnetism, however, are found in all matter. In recent times these effects have provided important clues to the atomic structure of matter.



Article key phrases:

fundamental forces of nature, electromagnetic theory, repulsive force, Magnetic forces, magnetic materials, doorknob, circumference, electrons, pulley, radius, close relationship, steering wheel, particles, electricity, axle, iron, motion, moves, distance, effort, appearance, car, load, sizes, user

 
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