Levers ppt

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day 3

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Levers

Class 1 Lever

Load
Effort

Fulcrum

Examples of Class 1 Levers

Class 2 Lever
Load

Effort
Fulcrum

Examples of Class 2 Levers

Class 3 Lever
Effort
Load

Fulcrum

Examples of Class 3 Levers

Archimedes
287 B.C.- 212 B.C.

“Give me a lever long enough and a
fulcrum on which to place it, and I shall
move the world.” -Archimedes

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Lever, simple machine consisting of a rigid bar that rotates about a fixed point, called a fulcrum. Levers affect the effort, or force, needed to do a certain amount of work, and are used to lift heavy objects. To move an object with a lever, force is applied to one end of the lever, and the object to be moved (referred to as the resistance or load) is usually located at the other end of the lever, with the fulcrum somewhere between the two. By varying the distances between the force and the fulcrum and between the load and the fulcrum, the amount of effort needed to move the load can be decreased, making the job easier. Physicists classify the lever as one of the four simple machines used to do work. (The other three are the pulley, the wheel and axle, and the inclined plane.) Work is defined in physics as the result of a force, such as a person lifting, that moves an object over a distance. A common example of a lever is the seesaw. The human arm is also a lever, where the elbow is the fulcrum and the muscles apply the force.

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Levers ppt

2. Class 1 Lever Load Effort Fulcrum

3. Examples of Class 1 Levers

4. Class 2 Lever Load Effort Fulcrum

5. Examples of Class 2 Levers

6. Class 3 Lever Effort Load Fulcrum

7. Examples of Class 3 Levers

8. Archimedes 287 B.C.- 212 B.C. “Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.” -Archimedes