#mechanics ladders

21 messages · Page 1 of 1 (latest)

pale olive
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Im not sure why they didnt draw a reaction force for the child on the ladder?

image.png image.png
tough summit
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the object doesn't experience a normal contact force, its only force is weight due to g

pale olive
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if its touching the ladder, how comes it doesn't? in other questions where there was a box for example there was a always a reaction force

wheat slate
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u dont show that though

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idk

pale olive
wheat slate
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ur looking at the child and ladder

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as one system

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so the normal contact force on the child from the ladder is internaal

pale olive
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what about in this scenario?

image.png
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how can i tell apart if the object is internal or not?

wheat slate
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like here u have to consider the reaction force from the plane on Q

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because

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ur only looking at Q

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the forces acting on it

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like in the ladder one u took moments

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sorry i dont have a good explanation

pale olive
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ah no worries

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do you know if theres a video on this

wheat slate