Need more info? check out the web page on 3 classes of levers:
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Lets talk about levers, and how we use these levers in everyday life and inside our bodies to produce movement, increase force, and make directional changes. Levers are one of the simplest forms of a machine.

A lever is a simple machine that allows you to gain a mechanical advantage in moving an object or in applying a force to an object. there are 3 classes of levers, The 1st class lever, 2nd class lever, and 3rd class lever.

A lever is a simple machine that consists of 4 parts

The 1st part is The Fulcrum, known as the pivot point, axis, or balance point,
The 2nd part is the Resistance or load
The 3rd part is the Effort Force
The 4th part is the Lever Arm…. which can be divided into 2 parts, the Force Arm and The resistance arm.

Now the main function of a lever is to gain a mechanical advantage in moving an object or gaining force. Mathematically, the mechanical advantage is determined by dividing the Force Arm by the resistance arm.
You may also learn about Levers in the human body, Lever physics, Lever Biomechanics, Wheelbarrow levers, seesaw levers and the 3 classes of levers in this video

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