Question

Sea-saw is an example of which class lever ?

• A. first class
• B. second class
• C. third class
• D. fourth class

Hint:

In first-class levers, the fulcrum is located between the effort and the load.

Answer 1

The Correct Option is A

Concept: A lever is a simple machine consisting of a rigid bar that rotates around a fixed point called the fulcrum. Levers are classified into three classes based on the relative positions of the fulcrum, load, and effort. In a first-class lever, the fulcrum lies between the effort and the load. Examples: \[ \text{Sea-saw, scissors, crowbar} \]

Step 1: Understand the arrangement in a sea-saw.
In a sea-saw, the pivot point (fulcrum) is positioned at the center, with effort and load acting on opposite sides.

Step 2: Identify the class of lever.
Since the fulcrum lies between the load and effort, the sea-saw is a: \[ \text{First-class lever} \] Hence, the correct answer is: \[ \boxed{(A)\ \text{first class}} \]