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SIMPLE MACHINES

 

Machines are things that make our daily lives easier for us. Without these machines, many tasks will become either difficult or totally impossible. They have few or no moving parts. These machines use energy to work.

 

A simple machine is any device that helps us to perform our work more easily when a force is applied on it. A screw, wheelbarrow and a bottle opener are all simple machines. To make any of these simple machines do work for us, we need to apply a force on it.

Complex Machines 

 

a Complex Machine - is a system in which simple machines all work together, parts of a complex machine that have just one function are called subsystems and often contain a simple machine.

ex. of complex machines can be as simple as scissors, or as complicated as a labtop



Read more: http://wiki.answers.com/Q/What_is_a_complex_machines#ixzz18fFHG6o5

Science    Simple and complex machines 

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