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प्रश्न
When does a force do work?
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उत्तर
A force does work whenever there is a displacement in the direction of force applied.
संबंधित प्रश्न
Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
State the condition when the work done by a force is positive. Explain with the help of examples.
What do you understand by the clockwise and anti clockwise moment of force?
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
State the condition when the work done by a force is negative. Explain with the help of examples.
A man spends 7.4 kJ energy in displacing a body by 74 m in the direction in which he applies force, in 2.5 s. Calculate the power spent (in H.P) by the man.
How is 1 kgf related to the SI unit of force?
State two conditions for work to be done.
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
