Question

Which one of the following is an example of class $\text{I}$ lever and $\text{MA}>1$?

Answer 1

Depending upon the relative positions of the effort, load and fulcrum, levers are classified into $3$ types.

1. Class $\text{I}$ levers
2. Class $\text{II}$ levers
3. Class $\text{III}$ levers

For Class $\text{I}$ levers, the mechanical advantage can have any value either greater than $1$, equal to $1$ or less than $1$.

$\text{MA}$ of a lever $=\frac{\text{Effort arm}}{\text{Load arm}}$

If $\text{Effort arm}>\text{Load arm}$, then $\text{MA}>1$

In claw hammer, effort arm is greater than load arm.

So, $\text{MA}>1$

Seesaw and physical balance - class $\text{I}$ lever and $\text{MA}=1$

Scissors - class $\text{I}$ lever and $\text{MA}<1$