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प्रश्न
Class III levers have mechanical advantage less than one. Why are they then used?
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उत्तर
With levers of class III, we do not get gain in force, but we get gain in speed, that is a longer displacement of load is obtained by a smaller displacement of effort.
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संबंधित प्रश्न
Fill in the blank:
In class II levers, the load is in between fulcrum and .........
Give one example of a class I lever where the mechanical advantage is more than 1.
Draw diagram to illustrate the position of fulcrum, load, and effort, of the following:
a pair of forceps
How can you increase the mechanical advantage of a lever?
How does the friction at the fulcrum affect the mechanical advantage of the lever?
In a lever, the fulcrum is at one end at a distance of 30 cm from the load and effort is at the other end at a distance of 90 cm from the load. Find :
(a) the length of load arm,
(b) the length of effort arm, and
(c) the mechanical advantage of the lever.
Explain why the mechanical advantage of a class II of lever is always more than 1.
Classify the following into levers:
A catapult
The diagram below shows a rod lifting a stone.
- Mark position of fulcrum F and draw arrows to show the directions of load L and effort E.
- What class of lever is the rod?
- Give one more example of the same class of lever stated in part (b).
Differentiate Class I lever and Class II lever.
