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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
State whether the following statement is True or False.
A machine performs work by itself.
Define the term ‘work input’ and ‘work output’ in relation to a machine.
Answer the following in short.
Mention any two methods by which we can take care of machines.
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Give scientific reason for the following:
Passengers in a bus are pushed backward when it starts suddenly.
Give an example of the following use of a machine to change the direction of force.
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the first order.
The ______ in the centre, the ______ on one side and the ______ on the other side make a lever of the second order.
Which machine will you use to do the following work? Write their type.
To cut vegetables.
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