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Question
State the types (or kinds) of lever, and give two examples of each kind.
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Solution
There are three kinds of the lever, depending upon the different positions of the load, fulcrum and the effort.
Type I: When fulcrum is in the middle.
Type II: When the load is between the fulcrum and the effort.
Type III: When the effort lies between the fulcrum and load.
RELATED QUESTIONS
Which class of lever will always have MA > 1 and why?
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.
Define Lever
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?
Sugar tongs
The following belong to which class of lever?
A pair of scissors
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?
The length of a nut-cracker is 12 cm. A nut, when kept at a distance of 4 cm from its fulcrum, requires an effort of 100 gf to crack it. What force will be required to crack the nut without using the nut-cracker?
