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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
Name a machine to obtain gain in speed?
Write down a relation expressing the mechanical advantage of a lever.
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.
The following belong to which class of lever?
A fire tongs
The following belong to which class of lever?
Sugar tongs
The following belong to which class of lever?
Wheelbarrow
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?
Draw a labelled sketch of a second class lever. Give one example of such a lever.
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.
The diagram below shows a lever in use.
(i) To which class of lever does it belong?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.
