[SOLUTION] Lever Systems

Advance the discussion or extend discussions already taking place. Responses must add new information not previously discussed. Pose new possibilities or opinions not previously voiced. Consider new factual information tied with critical thinking. Interesting and current research on the topic. Do not simply summarize another student’s post and agree/disagree. Consider starting out posts with, “A research article I found said, Did you know, 3 things I found interesting were…”  ” There are three types of levers in the body: first-class lever, second-class lever, and a third-class lever. All three levers consist of three basic components: a fulcrum, resistance arm, and an effort arm.  A lever itself is an extended solid object that turns around a fixed point, which is known as the fulcrum. The two other basic components of every lever being the resistance arm, which is the part of the lever from the fulcrum to the point of resistance and the effort arm, which similarly, is the part of the lever from the fulcrum to the point of effort. In our anatomy, joints act as the fulcrum, and the effort (input force), is the force that’s being applied to the lever, which is being done by the muscles. The resistance, also known as load or output force, being a force applied by the lever to move a load (for example a dumbbell or box).               The purpose of a lever is to either move a resisting object faster and further than the movement of the effort arm or to apply more force against an object that is resisting than the actual force applied to the lever. In other words, to build speed, distance, or force of a motion. The ratio of output force to its input force is known as the mechanical advantage (MA) of a lever. Mechanical advantage is calculated by the length of the effort arm divided by the length of the resistance arm. When talking about the three types of levers, the way in which they differ is by which component happens to be in the middle- the fulcrum, effort arm, or resistance arm. The first-class lever (EFR), has a seesaw like appearance with the fulcrum being located in the middle of the resistance (load) and the effort. A few examples of first-class levers in our body are the atlantooccipital joint of the neck or rocking of our feet on the tibia with the toes being raised and lowered. A second-class lever (FRE) on the other hand appears like a wheelbarrow and has the resistance in the middle. An example of this being the mandible when we open our mouths. The last type of lever is the third-class (REF). With this lever the effort is in between the fulcrum and resistance, similar to paddling a canoe. Most musculoskeletal levers being third-class. For example, the forearm when you flex your elbow. The interesting thing about levers is that they can change from one lever to a different one when we change our actions ”


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