Question

Define Lever what are its kinds?

Answer 1

Explanation

A Lever is a straight or bent rigid bar, capable of turning around a fixed point or an axis, commonly called a fulcrum

Classification

According to where the load and effort are located with respect to the fulcrum, there are three types or classes of lever:

• First-Class Lever
• Second Class Lever
• Third Class Lever

First-Class Lever

This lever has the fulcrum in between the weight and the force applied. Its order is represented as force-fulcrum-weight.

Example:

• Our hand pushing an object or seesaws, crowbars.
• Using scissors represents the use of two first-class levers.

Second Class Lever

The fulcrum is at one end and the force applied is on the other end. The weight is situated in the middle of these two. The order of this would be fulcrum-weight-force.

Example:

• Wheelbarrow
• Staplers

Third Class Lever

These are the levers in which the fulcrum is at one end and the force is applied in the middle and the weight is on the other end. The order is represented as a weight-force-fulcrum. In this case, we have to apply more energy to displace the weight to a longer distance.

Example:

• Fishing rod
• A broom