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प्रश्न
उत्तर
'Work' is said to be done when the applied force makes the body move i.e., there is a displacement of body.
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Work done = Force × ........................................
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
A box of weight 150 kgf has gravitational potential energy stored in it equal to 14700 J. Find the height of the box above the ground. (Take g = 9.8 N kg-1)
What are the units of (a) work, and (b) energy?
Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.
Its moment of a force scalar or a vector quantity?
Is the motion of moon around the earth in circular path an accelerated motion?
Distinguish between work and power.
Can work done be zero even if force acts on the body?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
State the amount of work done by an object when it moves in a circular path for one complete rotation. Give a reason to justify your answer.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
