Advertisements
Advertisements
प्रश्न
A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.
Advertisements
उत्तर
No there is no work done against the force of gravity because the displacement and the direction of force are at an angle of 90°.
Explanation:
Walking involves doing the same amount of work against gravity as standing because the weight of the body is the same.
So, the coolie does work against gravity equal to the total weight he is carrying (his body weight and the weight of whatever he is wearing, carrying, etc).
APPEARS IN
संबंधित प्रश्न
Define 1 J of work.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A sailboat is moving due to wind energy.
State two factors on which the work done on a body depends.
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
What is the relationship between Nm and dyne cm?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
How is horse power related to the S. I. unit of power?
