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प्रश्न
A body is acted upon by a force. State two conditions when the work done is zero.
उत्तर
Two conditions when the work done is zero are:
- There should be no displacement i.e. S = 0
- The displacement is NORMAL to the direction of the FORCE i.e. θ = 90°.
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संबंधित प्रश्न
How is work done by a force measured when the force is in an angle to the direction of displacement?
How is the work done by a force measured when the force is in the direction of displacement?
Choose one or more correct alternatives.
While dragging or lifting an object, negative work is done by ______.
- the applied force
- gravitational force
- frictional force
- reaction force
From the groups B and C, choose the proper words, for each of the words in group A.
| A | B | C |
| Work | Newton | erg |
| Force | Metre | cm |
| Displacement | Joule | dyne |
Explain the following concept in your own words with everyday examples:
Force
Explain the following concept in your own words with everyday examples:
Work
Explain the following concept in your own words with everyday examples:
Displacement
A force of 1000 N was applied to stop a car that was moving with a constant velocity. The car stopped after moving through 10 m. How much is the work done?
A force 'F' moves a load from A to C as shown in the figure below. For the calculation of the work done, which of these lengths would you use as the displacement?
A body, when acted upon by a force of 20 kgf, gets displaced by 1 m. Calculate the work done by the force, when the displacement is
- in the direction of force,
- at an angle of 60° with the force, and
- normal to the force. (g = 10 N kg-1)
