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Real situations — a hanging sign, a suspended mass, a sloped support — are modelled with static equilibrium. The skill is drawing a clear force diagram and choosing helpful directions to resolve in.
What you'll be able to do
Start with a force diagram showing weight, tensions, reactions and any applied forces. Then resolve in directions that make the algebra simplest — often along and perpendicular to a string or slope.
Tip — Choose resolving directions along unknown forces to simplify the equations.
Formula recap
Common mistakes to avoid
Key takeaways
Test yourself
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