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प्रश्न
Name the three classes of levers and state how are they distinguished. Give two examples of each class.
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उत्तर
Three classes of levers are:
(a) Class I levers or first-order levers:
Examples are:
 |
 |
| See Saw | Scissors |
Between the effort and the load is the fulcrum.
[Ratio of M.A. and V.R.] for levers in this class can be any value between one and one, either more or less than one. They can multiply forces.
(b) Class II levers or second-order levers:
Examples are -
 |
 |
| Lemon squeezer | Wheel Barrow |
Between effort and fulcrum is load, with the effort arm always longer than the arm. These levers' M.A. and V.R. are always greater than 1.
(c) Class III levers, or third-order levers:
Examples are
 |
 |
| Plucker or Fire Tong, (Sugar Tongs) |
Foot Treadle |
Always place effort between fulcrum and load. The effort arm is always shorter than the load arm. These levers' M.A. and V.R. are consistently less than 1.
संबंधित प्रश्न
Which class of lever has the mechanical advantage always more than 1? Give an example.
Give one example of a class I lever where the mechanical advantage is more than 1.
Name the class to which the following lever belong:
an oar rowing a boat.
The diagram given below shows the three kinds of levers. Name the class of lever and give one example of the class.
Name the machine to which the following belong:
Sugar tongs
Tick the most appropriate answer.
Which of the following is a Class II lever?
What is the use of the lever if its mechanical advantage is
- more than 1,
- equal to 1, and
- less than 1?
Both a pair of scissors and a pair of pliers belong to the same class of levers. Name the class of lever. Which one has the mechanical advantage less than 1?
Classify the things below.
| Sl. No | Examples | Class of Lever |
| 1. | Spade | |
| 2. | Seesaw | |
| 3. | Wheel barrow | |
| 4. | Plier | |
| 5. | Nail cutter |
Classify the following into levers:
Claw hammer
