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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
Fill in the blank:
In class II levers, the load is in between fulcrum and .........
Name the class to which the following lever belong:
A pair of scissors
Name the class to which the following lever belong:
a pair of sugar tongs
Tick the most appropriate answer.
Which of the following is a Class II lever?
Answer the following in short.
What is the basis of the classification of levers?
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?
Draw a labelled diagram of a class II lever. Give one example of such a lever.
Classify the following into levers:
A fishing rod
Match the following:
| 1. | Class I lever | a. | Wheelbarrow |
| 2. | Class II lever | b. | Seesaw |
| 3. | Class III lever | c. | Axe |
| 4. | Wedge | d. | Hockey sick |
Differentiate Class I lever and Class II lever.
