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Equilibrium - Physics 12 - Unit 3 Cheat Sheet by

A concise and clear cheat sheet summarizing all the essential concepts and formulas from the Equilibrium unit in high school physics. Includes conditions for static equilibrium, torque, centre of mass, and common force diagram setups. It’s written based on how I was taught, so some variables or notation might differ slightly from other resources. Great for reviewing problem-solving strategies and double-checking setup work during study sessions.

Formulas

ΣF=0
τ=rFsinθ
Στ=0
 

Key Concepts

Fnet is a vector → decompose to ΣFx=0 and ΣFy=0
θ = the angle the rope/wire makes with the "­cei­lin­g"
Transl­ational Equili­brium: (in this course) zero velocity systems
Rotational Equili­brium: involves a pivot and lever → uses torque (τ)
 

To Remember

θ = the angle a rope/wire makes with the surfac­e/c­eiling
pivot position determines which way F is going (CW or CCW)
Slanted beams - think of them parallel to the ground and the forces slanted instead
FN is present when rope/wire is on the ground
                                       
 

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  • Published: 31st May, 2025

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