Levers For Mrs. Berg’s Science Class
A lever consists of a rod or bar that rests and turns on a support called a  fulcrum . effort resistance
  A  force of effort  is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a wei...
Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
Here is a catapult you could make.
Three Classes of Levers <ul><li>First Class Lever </li></ul><ul><ul><li>The fulcrum is  between  the effort force and the ...
Three Classes of Levers <ul><li>Second Class Lever </li></ul><ul><ul><li>The resistance is between the effort and the fulc...
Three Classes of Levers <ul><li>Third Class of Lever </li></ul><ul><ul><li>The effort is between the fulcrum and the resis...
First Class Lever Second Class Lever Third Class Lever
 
 
Levers on the internet <ul><li>Check out these websites! </li></ul><ul><li>http://www.dynamicscience.com.au/tester/solutio...
Levers in the Body <ul><li>An example of a  first-class lever  is the joint between the  skull and the atlas vertebrae  of...
An example in the human body of a  second-class lever  is the  Achilles tendon , pushing or pulling across the heel of the...
An example of a  third-class  lever in the human body is the  elbow joint : when lifting a book, the elbow joint is the fu...
First Class Lever Second Class Lever Third Class Lever
 
 
Key Concepts: <ul><li>A lever pivots on one fixed point – up and down or side to side. </li></ul><ul><li>To use a lever, e...
Key Concepts: <ul><li>A lever can make work easier in the following ways: </li></ul><ul><ul><li>Increasing the force being...
Vocabulary <ul><li>Simple Machine- a machine with one moving part </li></ul><ul><li>Lever –a beam, bar, rod that turns or ...
beam bar rod board
rotate Turn
effort Resistance / Load fulcrum
work
friction
Mechanical Advantage
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Levers

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Levers

  1. 1. Levers For Mrs. Berg’s Science Class
  2. 2. A lever consists of a rod or bar that rests and turns on a support called a fulcrum . effort resistance
  3. 3. A force of effort is applied at one end of the rod to lift a load placed at the other end. A lever can help lift a weight with less effort. effort resistance fulcrum
  4. 4. Prying something loose with a crowbar is using a lever. Some machines, such as a catapult, use a lever to hurl objects.
  5. 5. Here is a catapult you could make.
  6. 6. Three Classes of Levers <ul><li>First Class Lever </li></ul><ul><ul><li>The fulcrum is between the effort force and the resistance force. </li></ul></ul>resistance fulcrum effort
  7. 7. Three Classes of Levers <ul><li>Second Class Lever </li></ul><ul><ul><li>The resistance is between the effort and the fulcrum. </li></ul></ul>
  8. 8. Three Classes of Levers <ul><li>Third Class of Lever </li></ul><ul><ul><li>The effort is between the fulcrum and the resistance. </li></ul></ul>
  9. 9. First Class Lever Second Class Lever Third Class Lever
  10. 12. Levers on the internet <ul><li>Check out these websites! </li></ul><ul><li>http://www.dynamicscience.com.au/tester/solutions/hydraulicus/simplemachineslevers1.htm </li></ul><ul><li>LEVERS in our BODIES! </li></ul><ul><li>http://www.dynamicscience.com.au/tester/solutions/hydraulicus/humanbody.htm </li></ul><ul><li>http://www.montgomery.k12.ky.us/camargo/Projects/simplemachines/simplemachines.htm </li></ul>
  11. 13. Levers in the Body <ul><li>An example of a first-class lever is the joint between the skull and the atlas vertebrae of the spine: the spine is the fulcrum across which muscles lift the head. </li></ul>
  12. 14. An example in the human body of a second-class lever is the Achilles tendon , pushing or pulling across the heel of the foot.
  13. 15. An example of a third-class lever in the human body is the elbow joint : when lifting a book, the elbow joint is the fulcrum across which the biceps muscle performs the work.
  14. 16. First Class Lever Second Class Lever Third Class Lever
  15. 19. Key Concepts: <ul><li>A lever pivots on one fixed point – up and down or side to side. </li></ul><ul><li>To use a lever, effort is applied to one end by pushing or pulling. The lever transfers this force to move the load. </li></ul>
  16. 20. Key Concepts: <ul><li>A lever can make work easier in the following ways: </li></ul><ul><ul><li>Increasing the force being applied. </li></ul></ul><ul><ul><li>Changing the direction of the force. </li></ul></ul><ul><ul><li>Increasing the distance or speed at which the job is done. </li></ul></ul>
  17. 21. Vocabulary <ul><li>Simple Machine- a machine with one moving part </li></ul><ul><li>Lever –a beam, bar, rod that turns or rotates on or around a fixed point </li></ul><ul><li>Fulcrum – a fixed point that allows the beam to rotate around it. </li></ul><ul><li>Work – the use of force to move an object </li></ul><ul><li>Force –any kind of push or pull on an object </li></ul><ul><li>Effort – the force that is used to do the work </li></ul><ul><li>Resistance – the force (load) that works against the effort </li></ul><ul><li>Load –the object or resistance being moved by the effort </li></ul><ul><li>Friction – the force that is caused when 2 surfaces rub together as an object moves </li></ul><ul><li>Mechanical Advantage – how the simple machine increases the effort </li></ul>
  18. 22. beam bar rod board
  19. 23. rotate Turn
  20. 24. effort Resistance / Load fulcrum
  21. 25. work
  22. 26. friction
  23. 27. Mechanical Advantage
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