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प्रश्न
Give two examples of couple action in our daily life.
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उत्तर
Examples of couple action in daily life:
(i) Opening and closing the cap of a bottle
(ii) Turning a key in a lock
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संबंधित प्रश्न
State two conditions when no work is done by a force.
Write the expression for work done by a force.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
Explain by an example that a body may possess energy even when it is not in motion.
A max X goes to the top of a building by a vertical spiral staircase. Another man Y of the same mass goes to the top of the same building by a slanting ladder. Which of the two does more work against gravity and why?
A boy does work when he pushes against a brick wall. (yes/no).
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
What should be the characteristic of a source of energy?
