Hey guys! Today I have a new post about trebuchets. I have a speed video for making the trebuchet. Then I'll talk about levers and their classes.
SPEED VIDEO: TREBUCHET
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NOT SO SIMPLE MACHINES
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Have you ever used something like a spoon to pry open some sort of container? If you've done that before, you used a lever! From tweezers to a broom, there are many different types of levers that are used for different things. They are very useful because they help do things people can't do, like crack a nut. If you are on a seesaw, and somebody bigger than you gets on the other side, he goes down, and you go up. How can you make him go up? Good Question! If the balancing point was closer to the bigger kid, you could lift him up easy as pie!The first person to figure out how to use a lever was a mathematician known as Archimedes. He was also a scientist, inventor, and engineer. One of his sayings was....
You can lift almost anything with a lever, the further the balancing point is from you, the easier it is to lift an object. There are different levers with different jobs. I'm gonna talk about 3 lever jobs."Give me a firm spot on which to stand,And I shall move the Earth."
LEVER JOBS
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Some levers have a job for lifting things. Have you ever tried to lift 3 books with one finger? I know that it hurts! With a couple of pencils, you can lift the books with little effort! You just need to position the pencils like a seesaw.
Do you have a nutcracker? I do, and I know that nutcrackers are levers with a job for breaking things. Try cracking a nut faraway from the hinge. Now try it with the nut close to the hinge. What's the difference? Leave your answer in the comments below.
Last is the most common job for a lever.... moving things! Your arm is a lever! Put your elbow on the table and put your finger on your hand, then move your hand upward. Your hand moved your finger a lot! This is an example of your arm being a lever.
These levers belong to 3 different classes. The 1st class of levers is like a seesaw. Your effort is on the left, the load is on the right, and the balancing point is in the middle. The other two classes are way different. For the 2nd class, the effort is on the left, the balancing point is on the right, and the load is in the middle. Last, but not least, the 3rd class. The 3rd class is like the 2nd except the load and the effort switch places. Those jobs aren't the only jobs that people need help with. There are many other jobs and levers out there. Like builders say, "You need the right tool for the job!"
Do you have a nutcracker? I do, and I know that nutcrackers are levers with a job for breaking things. Try cracking a nut faraway from the hinge. Now try it with the nut close to the hinge. What's the difference? Leave your answer in the comments below.
These levers belong to 3 different classes. The 1st class of levers is like a seesaw. Your effort is on the left, the load is on the right, and the balancing point is in the middle. The other two classes are way different. For the 2nd class, the effort is on the left, the balancing point is on the right, and the load is in the middle. Last, but not least, the 3rd class. The 3rd class is like the 2nd except the load and the effort switch places. Those jobs aren't the only jobs that people need help with. There are many other jobs and levers out there. Like builders say, "You need the right tool for the job!"
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| Class 3 is set wrong. Sorry. |
I hope you enjoyed my post about levers. In the post I'll be showing some of my activities. Bye guys! <3
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