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प्रश्न
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
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उत्तर
work being done in the following cases
(b) A boy climbing up the stairs
(d) A girl moving on the road.
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संबंधित प्रश्न
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
Derive a relationship between S.I. and C.C.S. unit of work
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
The work done on an object does not depend on the :
What is the relationship between Nm and dyne cm?
Is work done a scalar or a vector physical quantity?
(i) A 200g ball is thrown vertically upward with an initial velocity of 30 ms-1. Draw a velocity-time graph for the motion of ball.
(ii) How long will the ball take to reach the highest point?
(iii) What will be the kinetic energy of ball, when it returns to the starting point, neglecting the air resistance?
(iv) What will be the potential energy of ball at highest point?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
A donkey is carrying a load on its back.
