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| <center>The distinction between ‘power’ and ‘energy’</center> | | <center>The distinction between ‘power’ and ‘energy’</center> |
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>[[Image:]]</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| 10s
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| 100 m
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| 30n
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Energy: 30n x 100m = 3000jPower: 3000j/10s = 300j/s
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>[[Image:]]</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| 1000s
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| 100 m
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| 30n
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| Energy: 30n x 100m = 3000j
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| Power: 3000j/1000s = 3j/s
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| The important thing to stress is that in both cases, the ‘work done’ or ENERGY is the same – it being the product of the force (weight of the animal) measured in Newtons, and the distance travelled, measured in meters – regardless of speed. The units for ENERGY are Joules.
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| POWER is the ''rate'' at which the ENERGY is converted. This is measured in Joules per second (Watts).
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| {| style="border-spacing:0;"
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| | colspan="2" style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Representing Forces'''</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Drawing Demand'''</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Conceptual Demand'''</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Single Arrow</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Single Arrow</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Direction of arrow</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Force has direction</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Straightness of arrow</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Forces act in straight lines</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Length of arrow</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Magnitude of force</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Location of arrow’s tail</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>Objects as point masses</center>
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| {| style="border-spacing:0;"
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Two Arrows'''</center>
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| | style="border:0.5pt solid #000000;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"| <center>'''Two Arrows'''</center>
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| | style="border-top:0.5pt solid #000000;border-bottom:0.5pt solid #000000;border-left:0.5pt solid #000000;border-right:none;padding-top:0cm;padding-bottom:0cm;padding-left:0.191cm;padding-right:0.191cm;"
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| The important thing to stress is that in both cases, the ‘work done’ or ENERGY is the same – it being the product of the force (weight of the animal) measured in Newtons, and the distance travelled, measured in meters – regardless of speed. The units for ENERGY are Joules. | | The important thing to stress is that in both cases, the ‘work done’ or ENERGY is the same – it being the product of the force (weight of the animal) measured in Newtons, and the distance travelled, measured in meters – regardless of speed. The units for ENERGY are Joules. |
