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Machines - I


Machines have been used for centuries not only to make work easy, but also to make it efficient and safe. As the name suggests, the constructions of simple machines are not complicated and they are used for day-to-day simple works. The other characteristic feature of simple machines is that they do not convert energy from one form to another. Complicated machines such as bicycles and screwing machines are made up by combining two or more simple machines.

Simple machines can be broadly classified into two categories.

  • Lever
  • Inclined plane

These two types are further divided into sub-categories, as shown in the given diagram.


  • A lever is a rod which moves freely about a fixed point called the fulcrum. 


  • An inclined plane provides a sloping surface over which heavy things can easily be lifted or rolled down.

There are certain common terms that are used for almost every simple machine. Let us understand these terminologies first.

Machine Terminology

  • Effort — The force applied to a machine to do mechanical work is called effort.
  • Load …

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