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प्रश्न
Give three examples for leavers of the third order.
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उत्तर
Levers of third order:
(i) Cutting bread with a knife.
(ii) A boy writing on a piece of paper
(iii) Forceps
(iv) A fishing rod.
संबंधित प्रश्न
Name a machine to obtain gain in speed?
A man uses a crowbar of length 1.5 m to raise a load of 75 kgf by putting a sharp edge below the bar at a distance 1 m from his hand.
- Draw a diagram of the arrangement showing the fulcrum (F), load (L) and effort (E) with their directions.
- State the kind of lever.
- Calculate:
- load arm,
- effort arm,
- mechanical advantage and
- the effort needed.
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?
A see-saw
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?
Nutcracker
The following belong to which class of lever?
Knife
In the diagram shown alongside a claw hammer, mark the fulcrum (F) and indicate the directions of load (L) and effort (E) with arrows. What class of lever is it? Give one more example of this class of lever.
When we want to use a machine as a force multiplier, which class of lever should we preferably use? Give a simple diagram of such a lever.
