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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.
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
State whether the following statement is True or False.
All levers are force multipliers.
Describe three orders of levers giving an example of each. Draw neat diagrams showing the positions of fulcrum, load, and effort in each kind of lever.
Name the class to which the following lever belong:
a wheelbarrow
Name the class to which the following lever belong:
a see-saw
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.
Answer the following in a word or two or in a sentence.
Give one example of a machine used to multiply speed.
Explain why the mechanical advantage of the class III type of lever is always less than 1.
Classify the following into levers:
Wheel barrow
Name the load, effort, and fulcrum.
 |
 |
 |
|
1. ______ 2. ______ 3. ______ |
1. ______ 2. ______ 3. ______ |
1. ______ 2. ______ 3. ______ |
Differentiate Class I lever and Class II lever.
