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The Human Body: the Most Important Machine

How does this machine make work easier?

The human body allows us to move in every way we could imagine. We can dance for hours, run marathons, climb mountains, and twist through the air. When the human body moves and does work, we can build things and create a better world for all people, animals, plants, and things.

How could work be done without the use of this machine?

Well, there's not much that we could do without humans. However, what if we had the same souls and minds, just no physical bodies? Robots could perform most of the jobs we do today, but they couldn't replace the emotions and relations we create. Someone has to BUILD the robots, too. The power of the human body is a vital and often unappreciated resource.

Levers

These are two examples of levers acting in the human body. Levers are a bar free to pivot or move about a fixed point when an input force is applied. They help us to lift things more easily by pivoting about a fulcrum.

Wheel and Axle

Wheels and axles are used primarily to enhance range of

motion & speed of movement in the skeletal system.

In this picture, the humerus acts as the axle (that is the bone between your shoulder and elbow). The rotator cuff (blue) is the wheel, because when you rotate it slightly, the humerus moves with it. Simple machines like this in our arms help us throw things further distances while using less force.

Pulley

Simple Machines in the Human Body

Pulleys change the direction of an applied force. An example is the patella (kneecap), which alters the direction in which the quadriceps (patellar) tendon pulls on the tibia.

By Marianne Lamarche

Inclined Plane

An inclined plane is a flat surface that is slanted. It is typically used to help move/lift heavy loads.

Our feet have an inclined plane on the surface and underneath them. Our feet can hold up tons of weight, and the inclined plane helps to keep us balanced and sturdy. In fact, having "flat feet" is actually a medical problem.

Screw

A screw is like a twisted inclined plane.

If you experience a bad break of a bone, especially on your ankle, the doctor might operate on you and give you a syndesmotic screw. These screws help to realign the bones and get you back on your feet.

Wedge

Our teeth are an example of a wedge found in our body. Wedges work by putting a narrow end into something we want to come apart, and applying force to the wider end. When we eat, we put our bottom teeth into the middle of the food and break it apart with our top teeth. A wedge is also known as two inclined planes that work together; each row is one inclined plane.

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