Hi! I have a question. I'm doing an experiment based on this showing how the moment of inertia changes based on different distributions of mass. This relationship can be demonstrated by shortening the string length of a simple pendulum and measuring the velocity at the bottom of its swing for each string length. However, I'm confused on why my experimental velocities are all different from each other. I was told this would work by my physics teacher, but I'm confused. If the height to which I'm raising the pendulum doesn't change for each string length and therefore, neither does the potential energy, neither should the kinetic energy for each new string length. But all of my velocities are different. I know the angular velocity should be different but I'm finding the time taken to swing at the bottom of the pendulum (then used to find the velocity and then the angular velocity) changes when it shouldn't. What is the theory behind this?
One idea that may be causing trouble is that you can't directly find the speed at the bottom by measuring the time between release and reaching the bottom. More relevant to your work would be a relationship between moment of inertia and oscillation period. Look up "physical pendulum" for more details.
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This was extremely helpful and easy to follow through! thank you
Terrific! I appreciate this. It makes posting the video seem much more worthwhile.
Thats a really cool way to explain the concept, thanks a ton.
I appreciate your feedback. Hopefully the video helps a few folks!
Nice
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Hi! I have a question. I'm doing an experiment based on this showing how the moment of inertia changes based on different distributions of mass. This relationship can be demonstrated by shortening the string length of a simple pendulum and measuring the velocity at the bottom of its swing for each string length. However, I'm confused on why my experimental velocities are all different from each other. I was told this would work by my physics teacher, but I'm confused. If the height to which I'm raising the pendulum doesn't change for each string length and therefore, neither does the potential energy, neither should the kinetic energy for each new string length. But all of my velocities are different. I know the angular velocity should be different but I'm finding the time taken to swing at the bottom of the pendulum (then used to find the velocity and then the angular velocity) changes when it shouldn't. What is the theory behind this?
One idea that may be causing trouble is that you can't directly find the speed at the bottom by measuring the time between release and reaching the bottom. More relevant to your work would be a relationship between moment of inertia and oscillation period. Look up "physical pendulum" for more details.
This may help: th-cam.com/video/9uYcLhfTdNs/w-d-xo.htmlsi=tyKScyjTfSkC0FTD