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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
Can there be displacement of an object in the absence of any force acting on it? Think. Discuss this question with your friends and teacher.
State two conditions when no work is done by a force.
A bullet of mass 0.5 kg slows down from a speed of 5 m s-1 to that of 3 m s-1. Calculate the change in kinetic energy of the ball.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
How much work is done when a force of 1 N moves a body through a distance of 1 m in its own direction?
Is work done a scalar or a vector physical quantity?
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
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.
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
