Advertisements
Advertisements
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.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
What is a lever?
Name the class to which the following levers belong:
a pair of pliers
The diagram given below shows the three kinds of levers. Name the class of lever and give one example of the class.
Draw diagram to illustrate the position of fulcrum, load, and effort, of the following:
a see-saw.
Draw diagram to illustrate the position of fulcrum, load, and effort, of the following:
a nutcracker
Answer the following in short.
What is the basis of the classification of levers?
Give one example of a class I lever where mechanical advantage is less than 1.
Explain why the mechanical advantage of a class II of lever is always more than 1.
Class III levers have mechanical advantage less than one. Why are they then used?
Classify the things below.
| Sl. No | Examples | Class of Lever |
| 1. | Spade | |
| 2. | Seesaw | |
| 3. | Wheel barrow | |
| 4. | Plier | |
| 5. | Nail cutter |
