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Levers

Levers. Level 1 Physical Education Pakuranga College 2011. Levers are simple machines made up of a pivot (fulcrum), effort, and resistance (load) arm. Levers help apply force. Longer levers result in greater speed. Good for throwing & striking.

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Levers

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  1. Levers Level 1 Physical Education Pakuranga College 2011

  2. Levers are simple machines made up of a pivot (fulcrum), effort, and resistance (load) arm. • Levers help apply force. • Longer levers result in greater speed. Good for throwing & striking. • Shorter levers result in greater strength. Good for pulling, pushing and lifting. The most common lever found in the human body is the 3rd class lever Levers

  3. Fulcrum – the pivot point around which the movement happens. • Load – The weight that needs to be moved. • Effort – The place where the force is applied. In the body this is the effort produced by the contracting muscles. Components of a lever

  4. Levers are made up of the joints (fulcrum), and the bones that connect them to the objects being moved. • Levers in the human body can be manipulated to improve speed, and apply large forces at the same time. Levers in the human body

  5. These levers can help to either increase force or generate more speed depending on the position of the fulcrum. First Class Lever

  6. 1st class example: rowing oar

  7. 1st class body example:

  8. These levers allow more force to be produced because the effort arm, is longer than the resistance arm. Second Class Lever

  9. 2nd class lever examples: running and press-ups

  10. 2nd class body example:

  11. Third class levers generate speed rather than force Third class lever

  12. 3rd class examples: hockey stick and baseball bat

  13. 3rd class examples cont.: kayaking and diving board

  14. 3rd class body example

  15. FLE 123 This Statement shows what element is in the middle: • Fulcrum is in the middle in 1st class levers • Load is in the middle in 2nd class levers • Effort is in the middle in 3rd class levers How can we remember these levers?

  16. Here's what you'll need:• a 30 cm plastic ruler• 10 objects of varying weights•a pencil/pen• a level desk or table top Practical Lab

  17. Create each of the 3 classes of lever using the various pieces of equipment allowed. Practical Lab

  18. 1st, 2nd, 3rd class lever examples

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