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A rigid body such as a ladder leaning against a wall needs both force and moment equations. Resolving in two directions and taking moments about a clever point gives enough equations to solve.
What you'll be able to do
For a ladder against a wall: there is friction and reaction at the floor, a reaction (and possibly friction) at the wall, and weight at the centre. Use (both directions) and .
Tip — Take moments about the foot of the ladder to eliminate the floor’s reaction and friction.
Formula recap
Common mistakes to avoid
Key takeaways
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