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प्रश्न
What do you understand by work? Is work a scalar or a vector quantity?
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उत्तर
Work is said to be done when a force displaces a body through some distance, in its own direction, i.e.,
Work = Force × Displacement
W = F × d
Work is a scalar quantity.
संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
Name the quality which is measured in kWh.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
What do you mean by a centrifugal force?
State the condition when the work done by a force is negative. Explain with the help of examples.
State two conditions for work to be done.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
