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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.
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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 see-saw
Name the machine to which the following belong:
Sugar tongs
In a lever, the fulcrum is at one end at a distance of 30 cm from the load and effort is at the other end at a distance of 90 cm from the load. Find :
(a) the length of load arm,
(b) the length of effort arm, and
(c) the mechanical advantage of the lever.
Answer the following.
What is a Class I 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?
Class III levers have mechanical advantage less than one. Why are they then used?
Lemon juicer belongs to which type of lever? Why?
second-order lever ______.
