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== Expectations at Key Stage 2 == | == Expectations at Key Stage 2 == | ||
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== The distinction between ‘power’ and ‘energy’ == | == The distinction between ‘power’ and ‘energy’ == | ||
{| class="wikitable" | |||
|- | |||
| [[File:Hare_running-8255.jpg|200px]]|| 10s [[File:800px-Arrow_east.svg.png|35px]]100m | |||
|- | |||
| 30n[[File:242px-Arrow south.svg.png|15px]]|| Energy: 30n x 100m = 3000j<br />Power: 3000j/10s = 300j/s | |||
|- | |||
| [[File:Turtle-8917.jpg|150px]]|| 1000s [[File:800px-Arrow_east.svg.png|35px]]100m | |||
|- | |||
| 30n[[File:242px-Arrow south.svg.png|15px]]|| Energy: 30n x 100m = 3000j<br />Power: 3000j/1000s = 3j/s | |||
|} | |||
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. | ||
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== Falling Object == | == Falling Object == | ||
{| class="wikitable" | |||
|- | |||
| ||[[File:Arrow-up.jpg|65px]]||[[File:Arrow-up.jpg|65px]] | |||
|- | |||
| [[File:Cylinder3.png|65px]] || [[File:Cylinder3.png|65px]]|| [[File:Cylinder3.png|65px]] | |||
|- | |||
|style="text-align:center"| [[File:242px-Arrow south.svg.png|35px]] | |||
|style="text-align:center"| [[File:242px-Arrow south.svg.png|35px]] | |||
|style="text-align:center"| [[File:242px-Arrow south.svg.png|35px]] | |||
|} | |||
In the first instance, the object is stationary, held in place – with gravity being the only other force acting on it. As it released, the sudden massive imbalance of forces causes the object to accelerate towards the ground. | In the first instance, the object is stationary, held in place – with gravity being the only other force acting on it. As it released, the sudden massive imbalance of forces causes the object to accelerate towards the ground. | ||
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[[File:Force_image_4.jpg|450px]] | [[File:Force_image_4.jpg|450px]] | ||
Ask your students to draw the arrows at the point of take-off, mid-flight and as it comes in to land | Ask your students to draw the arrows at the point of take-off, mid-flight and as it comes in to land. | ||
== Measuring Forces == | == Measuring Forces == | ||
