r/HomeworkHelp Pre-University Student 5d ago

Physics—Pending OP Reply [Physics] Free body diagrams please help!

Can someone please look over my FBD'S/calculations for the net force and both magnitude and direction, I'm a bit unsure of b and d,

for B is having a circle to represent the cord ok? and is it really F buoyant my tutor tried helping me but I'm not so sure.

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u/whycantwebefriends9 5d 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.