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Understanding the Three Classes of Levers and Examples

Discover the mechanics of first, second, and third-class levers with examples like scissors, wheelbarrow, and golf club. Explore how each lever type favors either speed and range-of-motion or force. Learn about specific muscle actions too.

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Understanding the Three Classes of Levers and Examples

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  1. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion

  2. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion -example Triceps brachii extends the forearm at the humeroulnar joint

  3. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion -example Triceps brachii extends the forearm at the humeroulnar joint humerus radius ulna

  4. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion -example Triceps brachii extends the forearm at the humeroulnar joint humerus radius ulna Triceps brachii

  5. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion -or favors force

  6. Classes of Levers 1. First Class Levers -the fulcrum is between the force and the load -examples scissors, pliers, seesaw -favors speed and range-of-motion -or favors force

  7. Classes of Levers 2. Second Class Levers -the load is between the force and the fulcrum -example wheelbarrow -favors force -example Brachioradialis flexes the forearm at the humeroulnar joint

  8. Classes of Levers radius ulna 2. Second Class Levers -the load is between the force and the fulcrum -example wheelbarrow -favors force -example Brachioradialis flexes the forearm at the humeroulnar joint humerus

  9. Classes of Levers radius ulna 2. Second Class Levers -the load is between the force and the fulcrum -example wheelbarrow -favors force -example Brachioradialis flexes the forearm at the humeroulnar joint humerus Brachioradialis

  10. Classes of Levers 3. Third Class Levers -the force is between the load and the fulcrum -example tweezers, tennis racket, golf club -favors speed and range-of-motion -example Biceps brachii flexes the forearm at the humeroulnar joint

  11. Classes of Levers radius ulna 3. Third Class Levers -the force is between the load and the fulcrum -example tweezers, tennis racket, golf club -favors speed and range-of-motion -example Biceps brachii flexes the forearm at the humeroulnar joint humerus

  12. Classes of Levers radius ulna 3. Third Class Levers -the force is between the load and the fulcrum -example tweezers, tennis racket, golf club -favors speed and range-of-motion -example Biceps brachii flexes the forearm at the humeroulnar joint Biceps brachii humerus

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