Question

The diagram below shows a claw hammer used to remove a nail:

(A) To which class of lever does it belong ?
(B) Give one more example of the same class of lever mentioned by you in part (A).

Answer 1

Hint: Levers are one of the most basic machines which were invented by humans a long ago. They are also called mechanical levers. The underlying principle for their use is to do maximum work with minimal effort. A lever amplifies an input force to provide a greater output force, which is said to provide leverage.

Complete step by step answer:
(A) There are three kinds of levers. First class one has the fulcrum in between the force applied, the second class one the fulcrum lies at one end while the force is applied at the other end. The third class of levers the force is applied between the load and the fulcrum.The one given in the question falls in the first category. So, the answer for part (A) is class one.

(B) Another example of the same kind of lever that we have mentioned in part (A) is Shears used for cutting the thin metal sheets.

Note:Class one lever is those kinds of levers which have the fulcrum in between the force applied on it and its weight. The order is represented as force-fulcrum weight. These are the most basic types of lever. The examples which can be attributed are our hand pushing an object or seesaws. Other examples are wheels and axles. The other kind of levers are the second class and the third class. Examples of second class are wheel barrow, staplers etc. examples of third class are fishing rod, human jaw, baseball bat etc. In the third class of levers, we have to apply more energy to displace the weight to a longer distance.