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Levers, planes and axis - Gustavo, image, image, image, image, image,…
Levers, planes and axis - Gustavo
First class levers, Second class levers, and third class levers. (Types of levers)
In a first-class lever, the fulcrum sits in the middle, between the load and the effort, and both mechanical advantage and disadvantage happen in first-class levers. Some sporting example of first-class levers is a header in football. The neck muscles provide effort, the neck is fulcrum and the load is the head.
In a second class lever, the load sits between the fulcrum and the effort, and it is always a mechanical advantage. One sporting example of second class levers is jumping in the high jump. The effort is the gastrocnemius, the load is the body, and the fulcrum is the phalanges.
In a third-class lever, the effort is applied between the fulcrum and the load, and it is always a mechanical disadvantage. One sporting example of third-class levers is rowing in the water. The effort is the biceps, the fulcrum is the elbow joint located at the arm, and the load is the oars in order to propel the boat.
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Types of planes
Sagittal plane divides the body from top to bottom(vertically), resulting in a left and right side
Frontal plane divides the body from the top to bottom(vertically), resulting front and back sections.
Transverse plane divides the body across the middle, giving a top and bottom section.
Types of axis
Frontal axis runs from side to side, formed by the intersection of the frontal and transverse planes
Sagittal axis runs from the front to back, formed by the intersection of the sagittal and transverse planes.
Vertical axis runs from top to bottom, formed by the intersection of the sagital and frontal planes.
Mechanical advantage measures the efficiency of a lever. (effort arm/load arm) This happens when the load is greater than the effort. However, this is slow and has limited flexibility when you use this.
Mechanical disadvantage happens when the effort is closer to the fulcrum than the load. This provides fast movement and a large range of motion.
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