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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 body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
Name the quality which is measured in Wh.
State the factors on which moment of force about a point depends.
What do you understand by the clockwise and anti clockwise moment of force?
State the condition when the work done by a force is negative. Explain with the help of examples.
State two conditions for work to be done.
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person walks on a levelled road.
