Question

Which class of the lever is shown in the figure below?
 

A. First class
B. Second class
C. Third class
D. none of the above

Answer 1

Hint: A lever is a simple equipment including a beam or a rigid rod pivoted at a constant hinge, or fulcrum. A lever is a rigid body which is capable of rotating on a point by itself. The lever is divided into three types on the basis of the positions of the fulcrum, load and the effort. They are first class, second class, and third class.

Complete answer:
Basically, there are three types or classes of levers, in accordance to where the load and effort are located with respect to the fulcrum. As humans usually provide energy to levers, the terms effort and load are frequently used rather than input and output. First-class has the fulcrum located between the effort and load. The second class is having the load between the effort and the fulcrum. And the third class where effort was located between the load and the fulcrum. Each one this lever has its own advantages. In the figure, we can see that the effort is in between the load and fulcrum. Therefore it is a third-class lever.

Hence the correct answer is option C.

Note:
A first class lever is having the fulcrum located between the effort and load. The motion of the load will be in the opposite direction of the movement of the effort. The most commonly seen lever configuration is this one. A second class lever is having the load placed between the effort and the fulcrum. In this kind of lever, the motion of the load is in a similar direction as that of the effort. A third class lever is having the effort in between the load and the fulcrum. In these, the effort and load will be in a similar direction.