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प्रश्न
Define the term 'work'. Write the formula for the work done on a body when a force acts on the body in the direction of its displacement. Give the meaning of each symbol which occurs in the formula.
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उत्तर
Work is said to be done when a force causes a displacement. It is a scalar quantity that is mathematically given by the scalar product of the applied force and displacement caused. Joule is the SI unit of work. It is denoted by ‘J’.
We have a relation as,
W = FS cos θ
Where,
(F) - Force
(W) - Work
(S) - Displacement
θ - Angle between F and S
When F and S are parallel, θ = 0.
Then, work done is, W = FS
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संबंधित प्रश्न
Define 1 J of work.
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
MULTIPLE CHOICE TYPE
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Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Is work done a scalar or a vector physical quantity?
State the energy changes which take place when A toy car with a wound spring moves on ground.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
