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प्रश्न
Explain why scissors for cutting cloth may have blades longer than the handles, but shears for cutting metals have short blades and long handles.
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उत्तर
- A pair of scissors used to cut a piece of cloth has blades longer than the handles, so the blades move longer on the cloth than the movement at the handles.
- Shears used for cutting metals have short blades and long handles because this enables us to overcome a large resistive force with a small effort.
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संबंधित प्रश्न
Which class of lever has the mechanical advantage always less than 1? Give an example.
Give one example of a class I lever where the mechanical advantage is more than 1.
Name the class to which the following lever belong:
a crowbar
The diagram given below shows the three kinds of levers. Name the class of lever and give one example of the class.
How can you increase the mechanical advantage of a lever?
How does the friction at the fulcrum affect the mechanical advantage of the lever?
Draw a labelled diagram of a class II lever. Give one example of such a lever.
Classify the following into levers:
A catapult
Name the load, effort, and fulcrum.
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1. ______ 2. ______ 3. ______ |
1. ______ 2. ______ 3. ______ |
1. ______ 2. ______ 3. ______ |
Lemon juicer belongs to which type of lever? Why?
