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. Define the term 'energy'. Describe an activity to show an inter-relationship between 'work & energy'
4. Name a device which converts
(i) electrical energy to light energy
(ii) sound energy to electrical energy
(iii) chemical energy to electrical energy
Answers
Answer:
1. The difference is that work is said to be done when the force applied moves the body on which the force is applied in the direction of the force but when we say that we apply force on a body/object we may or may not move the object in the direction of the force, thus concluding that force may or may not do work.
2. The very best example that I can think of is that a vehicle starts moving, when it moves it travel some distance and the force is applied on it but we don't push the vehicle in any direction. In this way, work is done by the moving vehicle.
3. Energy is a body's capacity to do work. Example: Work is done on an object when the energy is transferred to that object. E.g.: Lifting pile of books from the table can be an example of work, as we use energy to lift the books up. The energy of the body is transferred to the pile of books.
4. i) An electric bulb
ii) A microphone
iii) A dry cell
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