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संबंधित प्रश्न
Explain briefly why the work done by a fielder when he takes a catch in a cricket match is negative.
A force acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of the force. What should be the value of θ to get the maximum positive work?
When does a force perform work?
A force of 30 N acts on a body and moves it through a distance of 5 m in the direction of force. Calculate the work done by the force.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the Work done.
Define 1 joule of work.
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
What happens to the work done when the dispacement of body is at right angles to the direction of force acting on it? Explain your answer.
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
Why is the work done on an object moving with uniform circular motion zero?
Name the physical quantity whose SI unit is Nm.
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
What should be the characteristic of a source of energy?
