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Elephant on the Bridge/Lesson Document: Difference between revisions
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The elephant walks out to the middle of the bridge and then becomes frightened so she stands quite still – the questions are about the second drawing – when the elephant is still. | The elephant walks out to the middle of the bridge and then becomes frightened so she stands quite still – the questions are about the second drawing – when the elephant is still. | ||
[[Image:Elephant_on_the_bridge.png| | [[Image:Elephant_on_the_bridge.png|300x300px]] | ||
Focus questions: | Focus questions: | ||
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(3) Any other forces (pushes/pulls) on the elephant or on the bridge? | (3) Any other forces (pushes/pulls) on the elephant or on the bridge? | ||
[[Image:simple view.png| | [[Image:simple view.png|300x300px]] | ||
There are many forces acting on both the bridge and elephant in this situation. The explanation provided here is a simplified one which deals only with the forces acting on the elephant. | There are many forces acting on both the bridge and elephant in this situation. The explanation provided here is a simplified one which deals only with the forces acting on the elephant. | ||
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(2) The force of reaction from the bridge pushing upwards on the elephant’s feet (see insert for fuller explanation). | (2) The force of reaction from the bridge pushing upwards on the elephant’s feet (see insert for fuller explanation). | ||
[Image:elephants foot.png|300x300px]] | |||
But because the bridge sags, its surface is not horizontal. This means that there is: | But because the bridge sags, its surface is not horizontal. This means that there is: | ||
