- #1

Joshua Smith

- 6

- 0

## Homework Statement

a cylinder sits inside of another fixed cylinder without friction and an internal force acts on the cylinder as shown in the diagram. Draw the normal force vector and write down the force and moment equations.

I drew in my normal vector to counteract the A force vector and wrote out the force and moment balance equations but when I did a check by plugging in numbers I got that the normal force causes a moment on the inner cylinder. What did I do wrong here?

## Homework Equations

Force balance, moment balance

In the picture the black dash is the thin outer cylinder

## The Attempt at a Solution

∑Fx = 0, ∑Fy = Ay - Ny = 0, ∑Fz = Az - Nz = 0,

∑Mx = (Az * you - Ay * za) + (Nz * r cosθ - Ny * r sinθ) = 0,

∑Mx = ( -Ay * za) + (Nz * r cosθ - Ny * r sinθ) = 0,

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