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प्रश्न
What is a first-order lever?
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उत्तर
When the fulcrum is between the effort and the load,
it is known as the Class I lever.
Example: scissors, pliers, seesaw.
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संबंधित प्रश्न
Write down a relation expressing the mechanical advantage of a lever.
A 4 m long rod of negligible weight is to be balanced about a point 125 cm from one end and a load of 18 kgf is suspended at a point 60 cm from the support on the shorter arm.
- If a weight W is placed at a distance of 250 cm from the support on the longer arm to balance the rod, find W.
- If a weight 5 kgf is kept to balance the rod, find its position.
- To which class of lever does it belong?
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?
The Physical balance
The following belong to which class of lever?
A see-saw
The following belong to which class of lever?
A fire tongs
The following belong to which class of lever?
A pair of scissors
The following belong to which class of lever?
Nutcracker
State the types (or kinds) of lever, and give two examples of each kind.
