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What are simple machines......?? Simple machines 

are machines that are the base of any other 

machine built. 

So, lets take a look at some of the most well known 

simple machines.......

 The pulley is used for many things, but is most commonly 

used for lifting objects that are heavier than what we can 

lift alone.The pulley works by extrapolating the weight of 

the object, as you can see on the photo to the left. This 

machine is useful because it allows us to lift things many 

times our weight and helps us build many of our modern day 

marvels. 

The screw is a simple machine that is used in most 

modern building projects. The screw is a little 

different from most other simple machines.The 

screw is actually two different simple machines 

combined into one, the screw is made up an 

inclined plane which wraps around a cylinder. The 

screw is very helpful in today's society because it 

can fasten two or more things together and can 

even carry things down its ramp, if the screw is 

large enough.

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