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प्रश्न
What is the S.I. unit of work? Define it.
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उत्तर
The S.I. unit of work is newton-metre or joule (J).
1 Joule = 1 N × 1 m.
1 J of work is said to be done by a force of 1 N if it displaces a body by 1 m in the direction of the force.
संबंधित प्रश्न
How is work done by a force measured when the force is in the direction of displacement?
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
State the factors on which moment of force about a point depends.
What do you mean by uniform circular motion?
Name the force needed for circular motion. What is the direction of the force?
What do you mean by a centrifugal force?
What is the work done when the force on the object and the displacement of the object are perpendicular to each other?
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.
Calculate the work done when:
A car is moved on a rough road through 30 m against a frictional resistance of 75 N.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
