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प्रश्न
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.
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उत्तर
Claw-hammer is the lever of the first order. One more example of this class of lever is a see-saw. In the following diagram, F indicates the position of the fulcrum. The arrows labelled L and E respectively indicate the directions of load and effort.
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.
Give three examples for leavers of 1st order.
Give three examples for leavers of the third order.
The following belong to which class of lever?
A claw-hammer
The following belong to which class of lever?
Sugar tongs
The following belong to which class of lever?
A pair of scissors
The following belong to which class of lever?
Wheelbarrow
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.
