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प्रश्न
Give three examples for leavers of 1st order.
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उत्तर
Levers of 1st order:
(i) Railway signal
(ii) Handle of water pump
(iii) Motor car foot brake
(iv) Nail cutter
संबंधित प्रश्न
Name a machine to obtain gain in speed?
Fig 3.17 below shows a lever in use.
(a) To which class of lever does it belong?
(b) If FA = 80 cm, AB = 20 cm, find its mechanical advantage.
(c) Calculate the value of E.
The following belong to which class of lever?
An oar of a boat
The following belong to which class of lever?
Pliers Tools
The following belong to which class of lever?
A claw-hammer
The following belong to which class of lever?
A fire tongs
The following belong to which class of lever?
A pair of scissors
Shears, used for cutting metals and scissors used for cutting clothes are both examples of levers of the first order. However, whereas the shears always have short blades and long handles, the scissors often have blades much longer than the handles. Explain, why this is so?
The following are an example of levers. State the class of lever to which each one belongs giving the relative positions of Load (L), Effort (E), Fulcrum (F):
(i) Scissors (ii) Sugar tongs (iii) Nutcracker (iv) Pliers.
The diagram shows the use of a lever.
- State the principle of moments as applied to the above lever.
- Which class of lever is this? Give an example of this class of lever.
- If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.
