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1. When do you resolve perpendicular to the plane and when do you resolve vertically?
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3. (Original post by BellHolly)
When do you resolve perpendicular to the plane and when do you resolve vertically?
You can either resolve perpendicular and parallel to the plane, or you can resolve horizontally and vertically (well, you can actually resolve in any two perpendicular directions you want, but those two are the most sensible). Which direction you choose won't usually matter all that much. Usually, I'd imagine parallel and perpendicular to the plane would be the simplest, but if you have a horizontal force applied to the particle, then it may be easier to resolve vertically/ horizontally (although there won't be much difference).

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