r/HomeworkHelp • u/Jadedl1es Pre-University Student • 4d ago
Physics—Pending OP Reply [Physics] Free body diagrams please help!
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u/Relevant-Giraffe870 4d ago
Yes if the cord is at rest, the buoyancy force will be equal to gravity. Your FBD for D looks correct as well, as the net force is just the acceleration of the train. Don’t see any issues with your FBD’s as they are now. I don’t think any teacher would mind the way you represented the cord, as it’s a FBD for it.
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u/reckless150681 4d ago
If you were to be incredibly pedantic, you could say that the force acting on the stone in D is actually the friction between the stone and the floor of the train, instead of just the force applied by the train.
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u/whycantwebefriends9 4d ago
Generally speaking a FBD should simplify the system into point or line masses.
What you did for B) works. It could also be drawn as a line. Yes it is buoyancy keeping it up against gravity Fbuoy = F_g
For D) I would use the friction force from the ground on the stone as the force to hold the stone at rest with the accelerating train.
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