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प्रश्न
State the law of conservation of energy.
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उत्तर
According to the law of conservation of energy, energy can neither be created nor can it be destroyed. It only changes from one form to another.
संबंधित प्रश्न
No work is done by a force if the body
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The loss in potential energy of the body,
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
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 is a push or a pull ______.
Write the two main conditions are needed for work to be done?
