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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 sailboat is moving due to wind energy.
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उत्तर
- Wind energy applies a force on the sailboat to push it in the forward direction.
- Therefore, there is a displacement in the boat in the direction of force.
- Hence, work is done by wind on the boat.
संबंधित प्रश्न
Find the kinetic energy of a body of mass 1 kg moving with a uniform velocity of 10 m s-1.
Explain by an example that a body may possess energy even when it is not in motion.
In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
What is the SI unit of work?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
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.
A force is applied on a body of mass 20 kg moving with a velocity of 40 ms−1. The body attains a velocity of 50 ms−1 in 2 seconds. Calculate the work done by the body.
The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
State whether work is done or not, by writing yes or no, in the following case:
A boy climbs up 20 stairs.
