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प्रश्न
When does a force do work?
उत्तर
A force does work whenever there is a displacement in the direction of force applied.
संबंधित प्रश्न
How is work done by a force measured when the force is in the direction of displacement?
Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s. Compare the power developed by the persons A and B.
In the following case write yes, if the work is being done and no if no work is being done.
A man trying to push a wall.
A machine raises a load of 750 N through a height of 16 m in 5 seconds. Calculate the power at which the machine works.
A man weighing 700 N runs up a flight of 15 steps, each 20 cm high, in 5 seconds. Calculate the power of the man.
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
