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Lever Systems - Coggle Diagram
Lever Systems
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First Class Lever Systems
A first-class lever is a very simple machine comprised of a beam placed upon a fulcrum. A load is placed onto one end of a beam, while an effort is directed onto the other end to counter the load.
This type of lever is found in the neck when raising your head to head a football. The neck muscles provide the effort, the neck is the fulcrum, and the weight of the head is the load.
Second Class Lever Systems
Second class lever – the load is in the middle between the fulcrum and the effort.
This type of lever is found in the ankle area. When standing on tiptoe, the ball of the foot acts as the fulcrum, the weight of the body acts as the load and the effort comes from the contraction of the gastrocnemius muscle. This second class lever is used when taking off for a jump or pushing against the blocks in a sprint start.
Third Class Lever Systems
Third class lever – the effort is in the middle between the fulcrum and the load.
During a biceps curl, the fulcrum is the elbow joint, the effort comes from the biceps contracting and the resistance is the weight of the forearm and any weight that it may be holding.
Disadvantage of Lever Systems
The third type of lever has the disadvantage of reducing the force exerted on the system. The force is between the load and the fulcrum. While it does create a mechanical advantage, it reduces the overall force, leading to inefficiency in the system.
the disadvantage of the first class lever is the fulcrum lies on more effort or more force.
Mechanical advantage of Lever Systems
When a lever's effort arm is longer than its load arm, it is said to have high mechanical advantage. Levers with high mechanical advantage can move large loads with a relatively small amount of effort. Second class levers always have high mechanical advantage. First class levers can have high mechanical advantage, if the fulcrum is close to the load.
