How does the gear system help to obtain gain in speed of an automobile?

Define the term efficiency of the machine.

State the class of lever to which scissors belong giving the relative positions of Load$\left(L\right)$, Effort$\left(E\right)$ and Fulcrum$\left(F\right)$.

State the class of lever to which sugar tongs belong giving the relative positions of Load$\left(L\right)$, Effort$\left(E\right)$ and Fulcrum$\left(F\right)$.

State the class of lever to which nutcracker belong giving the relative positions of Load$\left(L\right)$, Effort$\left(E\right)$ and Fulcrum$\left(F\right)$.

Figure given below gives an arrangement of moving and fixed pulleys. Copy the diagram and show the direction and magnitude of forces exerted by the four strings marked $1$ to $4$. What is the load that can be lifted by the effort $E$? Calculate the mechanical advantage of this system.