Table - 1 The changes you notice in objects Situation 1 Whether work who is doing Object on which Reason to say has been the work? work has that work done or not? (Name the been done? (Yes No) force) has been done on which work has been done The person The cement Man, Cement bag Yes Muscular is lifting the bag from ground to lorry using muscular force bag moved from the ground to the height of the lorry force 2 3 4
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Kamali is preparing for examinations. She spends lot of time in studies. She reads books, draws diagrams, organises her thoughts, collects question papers, attends classes, discusses problems with her friends, and performs experiments. She expends a lot of energy on these activities. In common parlance, she is ‘working hard’. All this ‘hard work’ may involve very little ‘work’ if we go by the scientific definition of work.
You are working hard to push a huge rock.Let us say the rock does not move despite all the effort. You get completely exhausted. However, you have not done any work on the rock as there is no displacement of the rock
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