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[Phy] Force and Motion - moment

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Force and Motion - moment

我想問點解如果一樣野臨到toppleH地步, 佢Hnormal reaction 會係0?
e.g. when a person with the maximum mass that can be supported by the plank without toppling, then the normal reaction of one end of the plank will be 0?

Thanks
   

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If there is no normal force exerting on the thing, the thing is not in contact with anything.
So the situation in your first question does not stand.
Regarding the example you gave, the normal reaction will be 0.
btw, tipping would be the mot juste instead of toppling.

[ 本帖最後由 mah71512 於 2018-2-25 11:07 PM 編輯 ]

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