Question

A second order lever :

• A. reduces the effort required
• B. increases the effort required
• C. effort is equal to load
• D. none of the above

Answer 1

Answer: (A)

reduces the effort required

$\text{Solution}:$

1. A second-class lever is one in which the load is located between the fulcrum and the effort.

2. In a second-class lever, moving the load changes the length of the load arm but has no effect on the length of the effort arm.

3. As the effort arm is always longer than the load arm in this type of lever, mechanical advantage decreases as the length of the load arm approaches the length of the effort arm, yet will always be greater than 1 because the load must be located between the fulcrum and the effort.

$\text{Hence A is the correct option}$