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प्रश्न
Which class of lever will always have MA > 1 and why?
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उत्तर
A Class II lever will always have MA > 1. This is because the load is between the fulcrum and the effort. So, the effort arm is always greater than the load arm. Hence, MA = E/L > 1.
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संबंधित प्रश्न
Class II levers are designed to have ______.
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.
Give three examples for leavers of second order.
The following belong to which class of lever?
A see-saw
The following belong to which class of lever?
Pliers Tools
The following belong to which class of lever?
A fire tongs
The following belong to which class of lever?
A pair of scissors
Draw a labelled sketch of a second class lever. Give one example of such a 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.
