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प्रश्न
What do you understand by work? Is work a scalar or a vector quantity?
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उत्तर
Work is said to be done when a force displaces a body through some distance, in its own direction, i.e.,
Work = Force × Displacement
W = F × d
Work is a scalar quantity.
संबंधित प्रश्न
A stone of mass m is rotated in a circular path with a uniform speed by tying a strong string with the help of your hand. Answer the following questions
1) Is the stone moving with a uniform or variable speed?
2) Is the stone moving with a uniform acceleration? In which direction does the acceleration act?
3) What kind of force acts on the hand and state its direction?
How is work done by a force measured when the force is in the direction of displacement?
State the condition when the work done by a force is positive. Explain with the help of examples.
State and define the S.I. unit of work.
Differentiate between work and power.
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 force applied.
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.
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
A force F when acts on a body, displace it by a distance d in a direction at an angle θ with the direction of the force. Write down the expression for the work done by the force.
