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प्रश्न
The moon is revolving around the earth in a circular path. How much work is done by the moon?
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उत्तर
Work done by the moon is zero as the force of attraction on the moon by the earth is normal to the direction of motion of the moon.
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संबंधित प्रश्न
When do we say that work is done?
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Explain by an example that a body may possess energy even when it is not in motion.
A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Can work done be zero even if force acts on the body?
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
What should be the characteristic of a source of energy?
(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?
Write the two main conditions are needed for work to be done?
