Oh got it, did not check if it was perpendicular, so the therm should be m⋅g⋅cosθ⋅r?
And then my final formula would be,
(m⋅r² + ½⋅m⋅r²)α + (k⋅r²)⋅θ - (m⋅g⋅cosθ⋅r) = 0 ?
I believe so. But if its not m⋅g⋅r, what could it be?
You are right, the spring wraps around the disc, so is the displacement x = r⋅θ?
And how to calcule the polar moment of inertia J of a disc with mass m with a concentrated mass m in point A?
Hello to all, first sorry about any mistakes because English is not my native language. I'm trying to solve this problem and I can't seem to find the equation of motion
Homework Statement
The disc and the point A both have mass m;
θ(0) = 0
2. The attempt at a solution
I tried to use the...