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Work and Energy — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceWork and Energy1 Mark
Question
Study the pictures given below and answer the questions:https://pg-data.sgp1.digitaloceanspaces.com/chapter_wise/15898/Q4.png" alt="Image" width="500" height="" />
(a) In which of the pictures above has work been done?
(b) From scientific point of view, when do we say that no work was done?
✓

Answer

(a) Girl studying : No work done
Boy playing with ball: Work is done
Girl watching T.V.: No work done Person lifting sack of grains : Work is done
(b) No work is said to be done when force is applied but there is no displacement.

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