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प्रश्न
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
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उत्तर
Work is done only in case of a boy climbing up a stair case.
संबंधित प्रश्न
When do we say that work is done?
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.
An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?
When is work said to be done by a force?
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
State the conditions of equilibrium for a rigid body.
Nm is the unit of .......
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 s. calculate the power used by her.
Fill in the boxe to show the corresponding energy transformation.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
