# data[].attributes.headline
History of simple machines: Who discover the principle of the lever and other simple machines?

# data[].attributes.subject
History of simple machines: Who discover the principle of the lever and other simple machines?

# data[].attributes.body
The Greek philosopher Archimedes studied simple machines or Archimedean simple machines around the 3rd century BC. He discovered the principle of mechanical advantage in the lever.

# data[].attributes.body
A simple machine is a mechanical device that has a few moving and non-moving parts that make work easier by changing the direction of a force or by changing the amount of force needed.

# data[].attributes.body
About 2.6 million years ago the wedge was created by our ancestors Homo erectus, therefore this is the oldest simple machine.

# data[].attributes.headline
What are the six types of simple machines?

# data[].attributes.subject
What are the six types of simple machines?

# data[].attributes.body
The inclined plane, lever, wedge, wheel and axle, pulley, and screw.

# data[].attributes.body
A pulley helps lift things easier by changing the direction of force used to lift an object.

# data[].attributes.headline
How does a lever help move heavy objects?

# data[].attributes.subject
How does a lever help move heavy objects?

# data[].attributes.body
By increasing the distance through which the force acts.

# data[].attributes.headline
How do the wheel and axle make it easier to move heavy objects?

# data[].attributes.subject
How do the wheel and axle make it easier to move heavy objects?

# data[].attributes.body
This simple machine helps remove the friction that is caused when moving objects and makes an easier movement.

# data[].attributes.headline
Compare and Contrast MECHANICAL ADVANTAGE and MECHANICAL EFFICIENCY 

# data[].attributes.subject
Compare and Contrast MECHANICAL ADVANTAGE and MECHANICAL EFFICIENCY 

# data[].attributes.body
Mechanical advantage is a measure of increased force achieved by using a tool. Meanwhile, mechanical efficiency is the measure of the effect that a mechanical system performs.

# data[].attributes.body
The input force is the amount of force or effort that we use in a simple machine to make it complete a task and the output force is the force used on an object by a simple machine.

# data[].attributes.headline
What are some examples of simple machines used in everyday life?

# data[].attributes.subject
What are some examples of simple machines used in everyday life?

# data[].attributes.body
Door wedges, wheelbarrows, bicycles, garage doors, knives, see-saws, scissors, and more.

# data[].attributes.headline
Why are simple machines important in our lives?

# data[].attributes.subject
Why are simple machines important in our lives?

# data[].attributes.body
Simple machines are important in our life because without them tasks will be much harder and will require more work. Also if simple machines weren’t created until now our society will be more will be in decline as it will be harder to complete tasks or simple tasks.