a boy is pushing a truck uses his energy to do his work but the truck does not move at all can you still say that boy is doing some work why
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yes the boy is doing work but mental work not physical
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A boy is pushing a truck uses his energy to do his work but the truck does not move at all can you still say that boy is doing some work : No
Explanation:
Work
It is done when force produces motion or we can say that when force acts on a body and it moves a body through certain distance .
The two conditions necessary for the work to be done :
Force must acts on a body
Body must move
It is of 3 types :
Positive work
Negative work
Zero work
Positive work
When body moves in a direction of applied force .
Negative work
When body moves in a direction opposite to direction of applied force .
Zero work
When force acts at 90' to the direction of displacement .
In the above asked question , body is not moving but continuously force is applied : The condition is not fulfilled that is why work is not done .
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