Question

Which of the following always has the mechanical advantage of less than 1?

[1 mark]

• A. Class I lever
• B. Class III lever
• C. Class II lever
• D. None of the above

Answer 1

The correct option is B Class III lever

We know,
For levers, $mechanicaladvantage=\frac{Effortarm}{Loadarm}$
In class III lever, the effort arm is always smaller than the load arm. Therefore, the mechanical advantage is always less than 1.