Simple Machines Work

Introduction to simple machines work:
Ancient people invented simple machines to do their work easily against different kinds of opposing forces.In the 3rd BC.the Greek philosopher Archimedes, studied the simple machines like lever, pulley, and screw.A mechanical device that alters the magnitude/direction of a force is called as a simple machine. A combination of these simple machines can form complex machines.

Work: Exertion of a force to overcome resistance.

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Principles of simple machines


A simple machine works on the principle of a lever.

A lever is a rigid, straight or curved bar, which rotates around a fixed point called the fulcrum. It has an effort/applied force and a load/resistant force.

First lever: The fulcrum is between the effort and load.
Scissors, Crowbars, pliers and seesaws.

Second lever: The resistance force is between the fulcrum and the effort force.
Wheel barrows, Nut crackers and bottle openers.

Third lever: The effort is between the fulcrum and the load.
Hammers, Tweezers and shovels.


Work of simple machines


A machine by the following functions makes work easier:

Transfer of force

The direction of a force is altered

The magnitude of a force is increased

The distance/speed of a force is increased.

Simple machines are of six types, such as the wheel and axle, lever, the inclined plane, the pulley, screw and the wedge.The ratio of output divided by input is called as Mechanical advantage.

Mechanical Advantage = output/input

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Conclusion to simple machine work


From the discussion made above, we can conclude that, the work done by the effort is equal to the work done on the load.

Work = Force x Displacement

Unit of work is a joule