Force- the effort or input needed to move the beam and load. Load- the item or object being moved or lifted on the plank. If the Force is closer to the Load, it would be easier to lift and a mechanical advantage. Examples are shovels, fishing rods, human arms and legs, tweezers, and ice tongs. A fishing rod is an example of a Class Three Lever. Class 3 has the effort between the load and the fulcrum. There are many examples of third class lever systems, including both flexion and extension at the knee joint.
During flexion at the knee, the point of insertion of the hamstrings on the tibia is the effort, the knee joint is the fulcrum and the weight of the leg is the load. The elbow joint is an example of a third class lever, operating with the effort between the load and fulcrum. Third-class levers are plentiful in human anatomy. One of the most commonly used examples is found in the arm. The elbow fulcrum and the biceps brachii effort work together to move loads held with the hand, with the forearm acting as the beam.
In a wheelbarrow, the closer the load is to the wheel, the greater the mechanical advantage. Nutcrackers are also an example of a second class lever. Third class lever With third class levers the effort is between the load and the fulcrum, for example in barbecue tongs.
Other examples of third class levers are a broom, a fishing rod and a woomera. In a third class lever the load moves further than the effort force and the mechanical advantage is low, which is why it's difficult to apply great force to the load. This can be an advantage by not squashing sausages on the barbecue! When you lift a load using your forearm you are using a third class lever. Your biceps muscles are attached to the forearm just in front of the elbow.
It cannot produce the same load force to effort ratio as a second class lever. Third class levers can take a small movement near the fulcrum and make a large movement where the load is. A stapler is an example of a second class lever. Force applied to the open end of the stapler closes the stapler at its hinge and drives the load, the staples, through the paper.
Third class levers have the effort between the fulcrum and the load, and they rely on greater force to move small loads long distances.
No, the shovel is a third-class lever. In such systems, the effort is positioned between the fulcrum and the load. Mechanics of using a shovel involve holding one end steady with a hand, making the fulcrum, while the other hand applies force, or effort, to pull up the load.
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