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Question
Name the three classes of levers and state how are they distinguished. Give two examples of each class.
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Solution
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.
RELATED QUESTIONS
State whether the following statement is True or False.
All levers are force multipliers.
Describe three orders of levers giving an example of each. Draw neat diagrams showing the positions of fulcrum, load, and effort in each kind of lever.
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:
a lemon squeezer
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Answer the following.
State the principle of levers.
Answer the following in a word or two or in a sentence.
Give one example of a machine used to multiply speed.
Answer the following in short.
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Draw a labelled diagram of a class II lever. Give one example of such a lever.
second-order lever ______.
