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प्रश्न
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.
To use a machine as a force multiplier, what class of lever should be preferred? Draw a sketch of such a lever.
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उत्तर
Though we can use either first class of lever or second class of lever, for multiplying force, we should preferably use a second class of lever. This is because the mechanical advantage of the second class of lever is always greater than one. A simple diagram of the second class of lever is shown alongside. The wheelbarrow, the bottle opener, and the mango cutter are some of the practical forms of the second class of lever.
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संबंधित प्रश्न
Write down a relation expressing the mechanical advantage of a lever.
The lever for which the mechanical advantage is less than 1 has :
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.
Which class of lever found in the human body is being used by a boy when he holds a load on the palm of his hand.
Which class of lever found in the human body is being used by a boy when he raises the weight of his body on his toes?
The following belong to which class of lever?
An oar of a boat
The following belong to which class of lever?
Nutcracker
The following belong to which class of lever?
Fore-arm
In the following diagram of a wheelbarrow, 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 the same class of lever.
