Question

If the IMA of a lever is 6, what do you know about the structure of the lever

Answer 1

let $a$ and $b$ are distances from the fulcrum to points $A$ and $B$ and let the force $F_{A}$ applied to $A$ is the input and the force $F_{B}$ applied at $B$ is the output.

The law of the lever is:

$$M A = \frac {F b}{F a} = \frac {a}{b}$$

Were:

$a$ and $b$ are distances from the fulcrum to points of input force $FA$ and output force $FB$ .

If $MA = \frac{a}{b} = 6$ we can say that: "a" - part of laver in 6 time more than "b"-part of laver. But we cannot say what class it is the lever.

Class 1: Fulcrum in the middle: the effort is applied on one side of the fulcrum and the resistance on the other side, for example, a crowbar or a pair of scissors or a seesaw.

Class 2: Resistance in the middle: the effort is applied on one side of the resistance and the fulcrum is located on the other side, for example, a wheelbarrow or a nutcracker or a bottle opener.

Class 3: Effort in the middle: the resistance is on one side of the effort and the fulcrum is located on the other side, for example, a pair of tweezers or the human mandible.