Both a pair of scissors and a pair of pliers belong to the same class of levers. Name the class of lever. Which one has mechanical advantage less than $1$?

The figure shows a uniform metre rule of weight $W$ supported on a fulcrum at the $60 \mathrm{cm}$ mark by applying the effort $E$ at the $90 \mathrm{cm}$ mark.

State with reason whether the weight $W$ of the rule is greater than, less than or equal to the effort $E$.

The figure shows a uniform metre rule of weight $W$ supported on a fulcrum at the $60 \mathrm{cm}$ mark by applying the effort $E$ at the $90 \mathrm{cm}$ mark.

Find the mechanical advantage in an ideal case.

In the given figure, it represents a nut cracker. In the diagram, mark the position of the fulcrum F and the line of action of load L and the effort E.