Types of Lever

Types of Lever

Levers are most basic machines which are used to do some work with minimal effort. We are aware there are various types of lever depending upon the position of the fulcrum, the force and the weight. Every tools which are used to perform work comes under any one of this category.

Levers are classified into three types namely:

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

First Class Lever

These are the lever which has the fulcrum in between the weight and the force applied. Its order is represented as force-fulcrum-weight. This is the most basic type of lever and has examples such has our hand pushing an object or see saws, crowbars. Using a scissor represents the use of two first class levers. A wheel and axle is also an example. Pulling a nail out of a wooden plank also represents first class lever.

Second Class Lever

In this, 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. Application of force at one end will result in some work done on the other end. Some common application of second class lever would be a wheelbarrows, staplers and doors or gates etc.

Third Class Lever

This 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 weight-force-fulcrum. In this case, we have to apply more energy to displace the weight to a longer distance. Some examples of third class lever would be a fishing rod, a broom, a baseball bat, a bow and arrow and most incredible, a human jaw.

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Practise This Question

Find the centre of mass of a uniform plate having semicircular inner and outer boundaries of radii R1 and R2 (figure 9 - E5)