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प्रश्न
Give two examples of couple actions in our daily life.
Write one example of a couple.
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उत्तर
- Opening and closing the cap of a bottle
- Turning a key in a lock
संबंधित प्रश्न
Define 1 J of work.
Name the physical quantity whose SI unit is Nm.
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
What is the ratio of SI units to CGS units of 'work'?
A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground.
(i) Calculate the mechanical advantage of the inclined plane. (ii) Calculate the effort applied by the coolie.
(iii) In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.
________ is said to be done when a force is acting on it.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
Force acting on a particle moving in a straight line varies with the velocity of the particle v as F = `K/v`, where K is a constant. The work done by this force in time t is
