Describe each class of lever and explain the characteristics of each.

There are three classes of Lever:

1) First Class of Lever: In this, Fulcrum is always changes the direction of the input force and can be used to increase the force or the distance

2) Second Class of Lever: In this, Fulcrum does not change direction of the input force & Output force is greater than the input force.

3) Third Class of Lever: In this, the input force is between the fulcrum and the load does not change the direction of the input force. Here, Output force is less than input force.

Hope this helps!

The lever is defined as the movable object that turns on a stationary fulcrum. The lever moves when the load is put on the beam.

There are three types of lever:

First Class of LeverSecond Class of LeverThird Class of Lever

The first class of lever includes the type of lever when the fulcrum is placed in the middle of the effort and load. The fulcrum can change the direction of the input force and is used to increase the force.

The second class of lever includes the type of lever when the load is present in the middle of the fulcrum and effort. The fulcrum is now unable to change the direction of the input force. The output force will be greater than the input force.

Thrid class of lever includes the type of lever, in which effort is present in between the fulcrum and load. The load cannot change the direction of the input force. The input force is greater than the output force.

Therefore, the three types of the lever are first class, second, and third class.

To know more about the lever, refer to the following link:

link

Muscles in the body us with a lot of things for example, if i wanted to lift a heavy box and had no muscle i would just collapse where i was because of the fact muscles hold us together. overall they are 650 muscle in the human body, all of them have different purposes and ways to keep us together. there are three types of muscle in the body skeletal, smooth, and cardiac muscle. skeletal muscle are attached to the bone and with movement. smooth muscle, this is found in the wall of our organs, such as our stomach, this muscle with movement   as well, without this muscle, we would only be allowed to eat small amounts. the cardiac muscle is the heart muscle and probably the most important one. these are only found in the walls of the heart and the heart pump blood to the other parts of your body. we have two different types of muscle fibers, slow twitch and fast twitch. slow twitch muscles enable long-endurance feats such as distance running. fast twitch fatigue faster but are used in powerful bursts of movements like sprinting. there are three different types of muscle contractions concentric, eccentric, isometric. concentric contraction causes muscles to shorten, thereby generating force.   eccentric contractions cause muscles to elongate in response to a greater opposing force. isometric contractions generate force without changing the length of the muscle.: //athleticquickness.com/muscle-contraction-types-part-1/