---------------------------------------HUMAN LEVERS-----------------------------------------------------------

Many movements of parts in our body can be explained by comparing them with levers. Believe it or not, the human body consists of all

three classes of levers, and now you learn all about them!

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Example: ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓ ↓

When throwing a base-ball overhand, you are using a class-one lever, your elbow acts as a fulcrum of a first-class lever, the triceps muscle apply the input force.The output force is the force that your hand applies to the ball to throw it. Since the length of the distance between the elbow and the triceps muscle, which we call the input arm or the effort arm, is less than the length of the distance from the elbow to the ball, which we call the output arm or the load arm, therefore the mechanical advantage when throwing the ball is less than 1.

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Here is a short video about the three classes of levers in the human body. The video will go very fast, so make sure to pause at each slide to look and read each section.

Axis

Fulcrum

Resistance

Load or output force

Force

Effort or input force

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