- #1
Kusu
- 5
- 0
I'm studying the motion of a physical pendulum, could someone help me make the final step in figuring out how to find the period so I can make predictions before carrying out a practical? Basically I have a meter rule with holes drilled along the length and will be pivoting it at various points.
I've done lots of reading and watched lots of videos, I know simple calculus, I understand moment of inertia and torque, small angle approximations and parallel axis theory. I've done dimensional analysis which resulted in:
[tex]T=\sqrt{\frac{I}{mgb}}[/tex]
where T = Period, I = Moment of inertia, m = Mass and b = distance from center of mass to pivot.
I know dimensional analysis doesn't give any constants, and I've seen in books that the actual equation is
[tex]T=2\pi\sqrt{\frac{I}{mgb}}[/tex]
but I'd like to be able to prove this. I know it has to do with angular acceleration and angular frequency, but not sure how. Can anyone point me in the right direction? Most the videos I watch just make the jump and say "we've previously shown why... [tex]\omega^2=\sqrt{\frac{mgb}{I}}[/tex] but I can't find any previous videos that show! :D
I think it's the [tex]\omega^2[/tex] that I can't see where it comes from.
Any help much appreciated!
K(p.s. If the Latex is messed up I'm probably working on fixing it, I've not used it much)
I've done lots of reading and watched lots of videos, I know simple calculus, I understand moment of inertia and torque, small angle approximations and parallel axis theory. I've done dimensional analysis which resulted in:
[tex]T=\sqrt{\frac{I}{mgb}}[/tex]
where T = Period, I = Moment of inertia, m = Mass and b = distance from center of mass to pivot.
I know dimensional analysis doesn't give any constants, and I've seen in books that the actual equation is
[tex]T=2\pi\sqrt{\frac{I}{mgb}}[/tex]
but I'd like to be able to prove this. I know it has to do with angular acceleration and angular frequency, but not sure how. Can anyone point me in the right direction? Most the videos I watch just make the jump and say "we've previously shown why... [tex]\omega^2=\sqrt{\frac{mgb}{I}}[/tex] but I can't find any previous videos that show! :D
I think it's the [tex]\omega^2[/tex] that I can't see where it comes from.
Any help much appreciated!
K(p.s. If the Latex is messed up I'm probably working on fixing it, I've not used it much)