Question

Which class of levers has a mechanical advantage always greater than one? What change can be brought about in this lever to increase its mechanical advantage?

Answer 1

Class $\mathrm{II}$ lever:

1. In class $\mathrm{II}$ lever load lies in between the effort and the fulcrum.
2. The mechanical advantage in terms of effort arm and load arm is $MA=\frac{Effortarm}{Loadarm}$
3. Mechanical advantage is more than one because the effort arm is always longer than the load arm.
4. Thus, the class $\mathrm{II}$ lever has a mechanical advantage always greater than one, and to increase the mechanical advantage of a class $\mathrm{II}$ lever the effort arm should be increased.