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प्रश्न
Name a machine to obtain gain in speed?
Give one example of a machine used to obtain gain in speed.
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उत्तर
When a pair of scissors is used to cut the cloth, its blades move longer on the cloth while its handles move a little.
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संबंधित प्रश्न
The diagram below shows a lever in use:
- To which class of levers does it belong?
- Without changing the dimensions of the lever, if the load is shifted towards the fulcrum what happens to the mechanical advantage of the lever?
What is a lever?
Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever?
Class II levers are designed to have ______.
Which type of levers have mechanical advantage always more than 1? Give reasons.
Give three examples for leavers of the third order.
Which class of lever found in the human body is being used by a boy when he holds a load on the palm of his hand.
The following belong to which class of lever?
Fore-arm
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?
