How Lever Works. 😲😵 #shorts #facts #science #sciencefacts #ytshort

How Lever Works. 😲😵 #shorts #facts #science #sciencefacts #ytshort

What Is a Lever?
A lever is a simple machine consisting of a plank or a beam that can rotate freely about a fixed point. It is used for moving, lifting, or propelling objects. Here are the key components of a lever:

Beam or Rigid Rod: The beam serves as the main body of the lever. It can be a straight rod or any other rigid shape.
Fulcrum or Pivot Point: The fulcrum is the fixed point around which the lever pivots. It acts as the support for the beam.
Input Force (Effort): This force is applied somewhere along the length of the beam. When you push down on one end of the lever, you’re exerting an input force.
Output Force (Load or Resistance): The output force occurs at the other end of the beam. It’s the force exerted by the lever on an object that needs to be moved or lifted.
How Does a Lever Work?
The ideal lever operates without dissipating or storing energy, meaning there is no friction in the hinge (fulcrum) or bending in the beam. In this case, the power into the lever equals the power out, and the ratio of output force to input force is given by the distances from the fulcrum to the points of application of these forces. This relationship is known as the law of the lever.

Types of Levers
Levers are classified based on the locations of the fulcrum, load, and effort. There are three main types:

First-Class Lever: The fulcrum is positioned between the input force and the output force. Examples include a seesaw or a crowbar.
Second-Class Lever: The output force is between the fulcrum and the input force. A classic example is a wheelbarrow.
Third-Class Lever: The input force is between the fulcrum and the output force. Examples include tweezers or a baseball bat.
Historical Origins
The earliest evidence of lever mechanisms dates back to ancient times:

Around 5000 BC, simple balance scales used levers in the ancient Near East.
In ancient Egypt (around 4400 BC), a foot pedal was used for the earliest horizontal frame loom.
In Mesopotamia (modern Iraq, around 3000 BC), the shadouf—a crane-like device—used a lever mechanism.
Egyptian workmen used levers to move and uplift obelisks weighing over 100 tons.
The Greek mathematician Archimedes (3rd century BC) famously stated, “Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.” Levers have played a crucial role in human history and continue to do so in various applications.

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