Statics › Section C · Equilibrium of particles › Topic C.3
2D particle equilibrium
Cables holding a sign, a rope pulling a box up a ramp, a line sagging under a load: when the forces on a particle lie in one plane, two equations find two unknowns. This topic shows three ways to solve them and how to choose axes that make the algebra short.
In this topic
- Two equations in a plane
- The component method
- Worked example: a lamp on two cables
- The force triangle
- Lami's theorem
- Choosing axes wisely
- Worked example: a box on a smooth slope
- Shallow cables carry huge tensions
- Several particles at once
- Common mistakes to avoid
- Key takeaways
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