E. Answer the following questions.
1.
Is there a difference between ‘applying a force' and 'doing work? Give reason
for your answer.
2.
Explain, by giving an example, that a moving object can do work.
3.
A porter keeps standing at a place while holding a suitcase of mass 20 kg
over his head for five minutes. Has he done some work? Give reason for
your answer.
4.
Define the term 'energy'. Describe an activity to show the inter-relationship
between work and energy.
5. Name a device which converts-
(a) electrical energy into light energy.
(b) sound energy into electrical energy.
(c) chemical energy into electrical energy.
Answers
1
They are different as when we apply force then a work is being done but if the force applied is negative then the work done is zero so it is not same
2when we push any object if it moves the work is done and if not the work is not done
3.no he has not done any work as work is equal to force ×distance (BUT IF HE PUT DOWN THE OBJECT THEN WORK IS DONE)
4One’s ability to do work is called energy and work is the transference of that energy.
Work is done on an object when the energy is transferred to that object in Physics.
E.g.: Lifting pile of books from the table can be an example of work, as we use energy to lift them up.
The energy inside the body is transferred to the pile of books.
5.bulb
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