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Physics / Work, Energy and Power

Physics / Work, Energy and Power

We all are familiar with the word ‘work’. We do a lot of work everyday. In this module explore the meaning of "work" in science terminology. Work done is equal to the product of the force and displacement.
Work done = Force(F) x Displacement (S)
The SI unit of work done = Newton(N) X metre(m) = joule(J)
The two conditions required to prove that work is done are :
• A force should act on an object.
• The object must be displaced.
Imagine you tried to push a rock and the rock does not move. Have u done any work? Think of other such examples from your surroundings.
Can the work done be positive, negative or zero? Yes, when displacement occurs in direction of force, it is positive work done, when displacement occurs opposite to the direction of force it is negative work done.
Learn about different types of work done, and also calculate how much work you can do by applying certain force.
If a man A takes 1 minute to lift a load to the roof of the bus, while another man B takes two minutes to lift the same load. Work done by both coolie is same. So how can you decide which of them has done work at faster rate. By calculating their power. Power is defined as the rate of doing work. Unit of power is watt. P = W / t also power = Force X velocity
Energy is the capability of doing work. Enjoy interesting facts about different forms of energy, Conservation of energy from your day to day life, commercial unit of energy

Exercises
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Exercises
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  • Work, Energy and Power - SmartTest

    A SmartTest on Work, Energy and Power

    • Accessed by: 418 Students
    • Average Time: 00:05:02
    • Average Score: 56.30
    • Questions: 60
    • Introduction to work, energy and power
    • Measurement of work
    • Types of work done
    • power
    • Introduction to energy
    • Kinetic energy and work energy theorem
    • Potential energy and its types
    • Different forms of energy
    • Transformation of energy
    • Renewable sources and non renewable sources of energy
    • Production of electricity from solar energy, wind energy, water and nuclear energy
    • Law of conservation of energy
    • Work, Energy and Power review

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