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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
What do you mean by the mechanical advantage of a lever?
Name the class to which the following lever belong:
a nutcracker
Name the class to which the following lever belong:
a see-saw
The diagram given below shows the three kinds of levers. Name the class of lever and give one example of the class.
State three differences between the three classes of levers.
Answer the following in short.
What is the basis of the classification of levers?
Classify the following into levers:
A catapult
The diagram below shows a rod lifting a stone.
- Mark position of fulcrum F and draw arrows to show the directions of load L and effort E.
- What class of lever is the rod?
- Give one more example of the same class of lever stated in part (b).
Lemon juicer belongs to which type of lever? Why?
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 |
