Levers may not seem like much, however, they are among the most commonly used items around. Levers are everywhere, and it’s not a new thing at all. Levers have been who knows when. Even Archimedes of ancient Greece said “Give me a lever long enough and I can lift the world”.

Levers may not be that powerful but they sure do make heavy lifting one heck of a lot easier. That’s not all levers can do though, for instance a car relies almost entirely on spinning levers, also known as gears. This video will show you all about that though.


Levers have also been used many times in weapons. One classic example is the catapult.

So the uses of levers are never ending so

          How do levers work?

For starters, the dictionary defines the lever as a rigid bar used for leverage.

But before we even begin learning about how levers work we should know about a few basic items.

1. The Fulcrum.
A fulcrum something that supports something else that relies on only the fulcrum to hold itself up. In the case of levers that something is a lever.

2.The Load.
The load is what you are trying to lift or balance. The load is sometimes referred to as the resistance force or just resistance

3.The Force
The force or effort is basically the force or weight you are using to lift or balance out the load.

There are three different classes of levers.

(Class one, two, and three levers in that order.)
In a first class lever of  the fulcrum is underneath the middle of the lever. The force is on one side and the load is on the other. A good example of a class one lever is a balance scale.

In a class two lever the load is put on the middle of the lever, the force is put on either side, and the fulcrum is put on the opposite side of the load. A good example of a second class lever is a nutcracker.

In a class three lever the force is applied to the middle of the lever, the fulcrum is on one side of the lever, and the load is on the other side of that. A good example of a class three lever is a claw hammer.

One cool example of a class one lever is a trebuchet. A trebuchet is a medieval siege weapon that uses a very basic lever to throw huge projectiles at an enemy. In a trebuchet the fulcrum is positioned very close to the effort which is a much heavier weight. The load is hung on the other side of the lever. When the very heavy counterweight or effort is quickly applied to the other side of the much lighter load the load goes flying.
To see what a trebuchet was like have fun playing around with it by crushing medieval castles and people here :
 To learn more about levers you can visit World-Star Academy's lever post here :Levers-World Star Academy

Did you learn anything? Please tell me if I did a good or bad job by commenting. If I did a bad job please tell me how I can improve this post.




Japan and the Samurai

As we all know the samurai were epic warriors with weird hats and razor sharp katana, but…

Who were the samurai actually?

The samurai were among the best warriors in history. Each samurai was a one man army compared to the European knights that were around at that time period. For one thing the samurai were masters at just about every martial art that was around back then, for another they not only had the best weapons around, but they also were experts at using them. To learn all there is to know about samurai warfare watch this video. And don't worry it is actually entertaining.

That’s pretty cool huh. As the video kind of explained the katana is pretty amazing, but believe it or not the katana is even cooler than he described. To get a grasp of the katanas full power watch this guy compare it to the European alternative at the time by slashing stuff with both the katana and the English long sword.

How the samurai were first created?

It all started back when Japan was made up of lots of city states. A city state is a city that has its own government. But anyway back then some barbarians were running around looting villages, robbing people, and stuff like that. So the daimyos (or rulers of the city states) were forced to hire expert warriors for protection. Over the course of time these warriors developed new weapons, martial arts, and codes to live by like the code of bushido. But it was not until Tokugawa, one of the daimyos, united Japan that the samurai became the government’s goons.
How did the age of the samurai end?
To learn about how the age of the samurai ended and what followed you can watch this crash course video, and don’t worry it’s not too boring.
Did you learn anything at all, or was this post about as good as crap. Please comment and tell me.
Sorry I could not find any games or activities about this subject.


The Aztecs

Who were the Aztecs?

The Aztecs were an ancient American civilization that was located in modern day Mexico.

In its height of power there capitol city was among one of the greatest in the world at that time, and would have been a wonder of the world if it wasn’t burnt to the ground. To get a basic outline of the Aztecs you can watch this video.

So as you can tell from watching that video the Aztecs were quite obviously insane but believe it or not they were even wackier than you might have thought. Take for example their food, you can learn about the repulsively nauseating food they ate by watching this episode of horrible histories Historical Masterchef.


Pretty sickening huh? Another awkward thing about the Aztecs is that they used chocolate for currency. At the time of the Aztec Empire most of the world never even knew what chocolate was since the Americas are one of the only places you can grow chocolate, and the Americas had not yet been discovered. But the Aztecs had plenty of chocolate, and everyone loved chocolate. So they used it for currency.  As a matter of fact Montezuma drank fifty goblets of chocolate a day.


 The Aztecs fell to the Spaniards pretty easily. Why that is? Watch this video to find out.
What do you think about the Aztecs?
Please comment


Top 5 Funniest Political Videos

Recently I have been watching some pretty funny videos with political humor in them. In this post I will be posting the best ones.

5.  Obama Sings on Huckabee

4. He's Barrack Obama

3. Herman Cains Version of Imagine
2. God Made a Liberal

     In the God made a liberal video they are imitating this Superbowl commercial.      

                                  This is the God made a liberal video.
1.Phil Davidson