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प्रश्न
Answer the following in short.
Mention any two methods by which we can take care of machines.
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उत्तर
Taking care of machines: Some of the ways in which machines should be cared for are given below.
- Machines should be kept in a clean environment, which is free from dust and moisture.
- When not in use, machines should be kept covered to prevent the collection of dust on them.
- Machines made of iron should be protected from rust by coating them with paint.
- The moving parts of a machine should be regularly oiled with good-quality machine oil to reduce friction and wear and tear.
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संबंधित प्रश्न
Can a machine have an efficiency of 100%? Give a reason to support your answer.
Answer the following.
What do you understand by a complex machine?
What do you understand by a simple machine?
Define Simple machine
Give an example where a machine is used to obtain gain in speed.
What is the efficiency of an ideal machine?
What is the efficiency of a machine?
A simple machine enables us to lift a load of 10,000 N by the application of an effort of 500 N. However, when the point of application of the effort moves through 2.5 m, the load gets raised through 10 cm only. What are the values of the:
(i) M.A.
(ii) V.R. and
(iii) Efficiency of the machine?
Identify and mention the types of simple machines.
 |
 |
 |
| ______ | ______ | _______ |
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 |
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| ______ | ______ | ______ |
Name a machine for each of the following uses:
- to multiply the force,
- to change the point of application of force,
- to change the direction of force,
- to obtain the gain in speed.
