(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

There is a 5m ladder leaned against a wall, making an angle of θ with the ground. The ground is rough (getting at friction), and the wall is frictionless. Here's an ASCII attempt:

|\

|..\

|....\5

|......\

|......θ\

We want to make a force diagram for the ladder, then find the value of the forces acting on it.

Dealing purely with variables aside from the 5m length.

2. Relevant equations

Sum of F = ma

Torque = F x l

3. The attempt at a solution

I'm fine with the force diagram, I think. You've got gravity downwards, the force of friction to the left, some normal force upwards, and some normal force by the wall directly to the right.

As for what they are...

Force of gravity = mg

FNfloor = mg?

Ff = ?

FNwall = ?

Ff = FNwall

I think FNfloor = mg, and Ff = FNwall, because this is an instance of static equilibrium, so sum of F = 0. Is that correct? And how do I account for torque?

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# Homework Help: Ladder leaned against a wall; forces

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