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प्रश्न
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उत्तर १
The law of conservation of energy states that energy cannot be created or destroyed; the sum total of energy in a closed system remains unchanged. Energy only changes from one form to another.
उत्तर २
According to the law of conservation of mechanical energy, the sum of kinetic energy and potential energy always remains constant.
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संबंधित प्रश्न
State the condition when the work done by a force is positive. Explain with the help of examples.
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
Name the quality which is measured in Wh.
A body of mass m is moving with a uniform velocity u. A force is applied on the body due to which its velocity changes from u to v. How much work is being done by the force?
What is a centripetal force?
What do you mean by a centrifugal force?
In which one of the following cases is the work done more? When the angle between the direction of motion and that of the force is (i) 90° (ii) 0°.
State two conditions for work to be done.
