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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’.
Suma is swimming in a pond.
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उत्तर
Suma is moving forward while swimming by applying force in a particular direction and is getting displaced in the direction of force hence, work is being done.
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संबंधित प्रश्न
How is work related to energy?
In case of negative work, the angle between the force and displacement is :
The work done on an object does not depend on ______.
What is the relationship between Nm and dyne cm?
What is the work done when the object acted upon by a force remains at rest?
Complete the following sentences:
The SI unit of work is ....... and of power is .......
State the energy changes which take place when A stone dropped from the top of a cliff reaches the ground after some time.
(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?
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
