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What is a lever? Part 2
By, Chandler C
What is a lever
A lever is one of the seven simple machines that help you lift and transport objects much easier. There are many levers you use every day, think every time you pick something up your arm is a lever. When you cut something with scissors the scissors are a lever. It is used when you work in the garden, the sheers that you trim trees with. Or the wheel barrow that helps you transport plants and gardening tools from place to place in your garden.
Going to this website will give you a real live lever: (see third page)
The First Class Lever: what are they
The first class is where the fulcrum is in the middle and the force and the load are on opposites of the fulcrum. Some types of first class levers are a seesaw, a crowbar, some scissors, and shears.
This is a seesaw the seesaw is a first class lever
This is a diagram of a first class lever
The Second Class Lever: What are they
The second class is where the fulcrum is at a side the load is in the middle and the effort is on the opposite side of the fulcrum. Some types of class 2 levers are the wheelbarrow, or a nutcracker.
This a wheelbarrow the wheel barrow is a second class lever
This is a diagram of a second class lever
The Third Class Lever: What are they
A third class is where the fulcrum is on the end and the effort is pushing up in the middle and the load is on the opposite side of the fulcrum. Some types of third class levers are your arm, tweezers, a catapult, and a broom
This is a joint in a arm it is a third class lever
This is diagram of a third class lever
Lets see what we have learned about a levers. In the pictures below can you tell which one is a lever?
Correct now can you tell what class lever it is?
Sheers; a devise that you use to trim your bushes with
Fulcrum; a devise that is put at a point under the board prop or support
Force or Effort; a push or a pull on an object
Load; the weight supported by a structure or a part.
Answer: Class 2 Lever
Books, editors o.T.
Alexandria, VA: Time-Life, 1992. Print.
Lever: force amplification. Art. Encyclopedia Britannica. Web. 22 Sept. 2011.
Lewis, Peter, and Briony Ryles. Mechanics. Tucson, AZ: Brown Bear Books, 2010. Print.
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