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प्रश्न
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.
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उत्तर
- While carrying a load, the donkey has to apply a force in the upward direction. But the displacement of the load is in the forward direction.
- Since displacement is perpendicular to force, the work done is zero.
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संबंधित प्रश्न
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
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What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
Each of the following statement describes a force acting. Which force is causing work to be done?
Name the force acting away from the centre of circular path.
No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
