Describe each class of lever and explain the characteristics of each

Explanation:

Class 1 has the fulcrum placed between the effort and load. Class 2 has the load between the effort and the fulcrum. Class 3 has the effort between the load and the fulcrum.

First Class

For this class of lever, the motive force (the applied exertion of effort) and resistive force (force opposing this exertion) are on either side of the fulcrum, which is right in the middle. Tools such as scissors and seesaws are examples of this type of lever. When you flex your muscles, agonistic and antagonistic muscle groups act as the force and resistance, respectively. In your arm, your elbow is the axis of rotation. The axis being midway between the force and the resistance results in greater speed, force, and range of motion.

Second Class

Second class levers have resistance between the axis and the applied force. When you use a nutcracker or wheelbarrow, you are using a second class lever. An example of a second class lever in your body is your foot when you stand up on your toes. The balls of your feet are the axes in this case. Your ankle plantar flexors act as a force against the resistance of the body at tibial articulation. Second class levers result in smoother movements because of less inertia, as well as less force.

Third Class

In third class levers, the force is between the axis and resistance. One example is a person positioning their hands on the middle (force) and the end (axis) of the oar through the water (resistance). The knee acts as a third class lever when your hamstring contracts (force) and your lower leg flexes as a result (resistance). Third class levers lead to higher levels of inertia, meaning they are harder to stop.

As you may have noticed, the relative positions of the axis, exerted force, and resistant force have an impact on factors such as inertia and how smoothly movement occurs. The classes of levers provide different combinations of important mechanisms, each of which is important for a different class of tasks.

Explanation:

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