Changes
From Karnataka Open Educational Resources
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, 16:38, 25 September 2012
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| conversions in this section. | | conversions in this section. |
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− | Some of the key ideas to be covered in this
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− | section are:
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| + | Some of the key ideas to be covered in this section are: |
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| # Work has a physical meaning in relation to the force operating and this is linked to the concept of energy. Such work done can be measured in physical terms. | | # Work has a physical meaning in relation to the force operating and this is linked to the concept of energy. Such work done can be measured in physical terms. |
| # What do we mean when we say an object has energy? We are introduced to the idea of kinetic and potential energy. | | # What do we mean when we say an object has energy? We are introduced to the idea of kinetic and potential energy. |
− | # Effectivesness of doing work is called power; work, energy and power have units of measure. | + | # Effectivesness of doing work is called power; work, energy and power have units of measure.<br><br> |
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| == Concept flow == | | == Concept flow == |
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| energy is needed to do work. We will explore the idea of work done, | | energy is needed to do work. We will explore the idea of work done, |
| energy, power and energy conversions in this section. | | energy, power and energy conversions in this section. |
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| Work always involves some opposing forces. What | | Work always involves some opposing forces. What |
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| This is true for any type of work. | | This is true for any type of work. |
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| Suppose that instead of lifting the box, we push | | Suppose that instead of lifting the box, we push |
| it across a rough floor. In this case, we are not working against | | it across a rough floor. In this case, we are not working against |
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| that exists between the moving the box and the floor. | | that exists between the moving the box and the floor. |
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| In physical terms, work done is | | In physical terms, work done is |
| directly proportional to both the applied force and the distance | | directly proportional to both the applied force and the distance |
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| and also to describe the energy content of food stuff. | | and also to describe the energy content of food stuff. |
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| = Energy in the world = | | = Energy in the world = |
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