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Walking the plank


Lizwi

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Where did you get the "3.75"?  Is that the distance from the right hand end of the plank to the left support?  The left support is irrelevant.  If the plank starts to pivot because of weight on the right end, it will pivot on the right support.  I think that "3.75" should be 3- .75= 2.75.

 

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3.75 is the distance from S1 to the person, since my origin is at S1. 

 

The distance between the two saw horses is 1.5m, and the distance from the centre of the blank is 3m so if you work out you can see that the distance from sawhorse 1 is 3.75m.

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