Science lesson


Light & Shadows:

Click here==> shadows

How we see things:

And here==> How We see things

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Simple machines

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What Is A Lever? A  lever  is a simple  machine  consisting of a bar that rotates around a fixed point. The fixed point of a lever is called the fulcrum. Like other machines, a lever makes work easier by changing the force applied to the machine or the  distance  over which the force is applied. Classes of Levers Other levers change force or  distance  in different ways than a hammer removing a nail. How a lever changes force or distance depends on the  location  of the input and output forces relative to the fulcrum. The input force is the force applied by the user to the lever. The output force is the force applied by the lever to the object. Based on the location of input and output forces, there are three basic types of levers, called first-class, second-class, and third-class levers.  Classes of Levers Class of Lever Example of Lever in This Class Location of Input & Output Forces & Fulcrum* Ideal Mechanical ...
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