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प्रश्न
Why is this so machines have to be maintained?
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उत्तर
A machine is composed of many parts. These parts rub against one another when in use. Due to this, these parts wear out with time. Also, soil and dust create more friction between the parts, which further deteriorates their condition. Even some parts get affected by weather and thus rust and erode. Because of these factors, the machine can become useless if proper care is not given to it. So, it is very necessary that we have proper equipment and methods for the maintenance of machines. Thus, machines should be sent for maintenance checks at fixed intervals of time to ensure their proper working.
संबंधित प्रश्न
Name six simple machines. Give an example of each machine.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
What is an ideal machine?
What is an inclined plane?
Write an expression for the mechanical advantage of an inclined plane in terms of its length I and vertical height h.
Write the relation between mechanical advantage, velocity ratio and efficiency.
What is the efficiency of an ideal machine?
Comment on the statement ‘The mechanical advantage of a machine is greater than 1’. Give an example of a lever mechanical advantage is:
(i) greater than 1.
(ii) Equal to 1.
Identify and mention the types of simple machines.
 |
 |
 |
| ______ | ______ | _______ |
 |
 |
 |
| ______ | ______ | ______ |
The idea of a simple machine originated with the Greek philosopher Archimedes.
