How Do You Calculate the MOI for a Rod with a Mass Attached?

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In summary, the speaker is asking for help finding the moment of inertia (MOI) for a lab that is due tomorrow. They are confused about what values to use for the rod and attached mass. The lab's goal is to find the MOI of a uniform rod with a mass attached at 3/4th of the way down, and the rod is 1 m long and 97.1 g in weight. The speaker is looking for guidance on how to calculate the MOI for this complex system.
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Sorry about the somewhat extreme thread but I'm sort of desperate. I missed nearly the whole rotation unit cause of illness and I need to find the MOI for a lab that's due tomorrow. I'm confused about what to plug in where. The lab goal is to find the MOI of a rod of uniform density swinging with a point of rotation at the end of the rod. The rod has a mass attached about 3/4 the way down the rod from the point of rotation. The mass is a circular washer and is about 20 g in weight. The rod is 1 m long and weights 97.1 g. How do you find the MOI of the rod/mass complex

Thanks!
 
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user_name12 said:
Sorry about the somewhat extreme thread but I'm sort of desperate. I missed nearly the whole rotation unit cause of illness and I need to find the MOI for a lab that's due tomorrow. I'm confused about what to plug in where. The lab goal is to find the MOI of a rod of uniform density swinging with a point of rotation at the end of the rod. The rod has a mass attached about 3/4 the way down the rod from the point of rotation. The mass is a circular washer and is about 20 g in weight. The rod is 1 m long and weights 97.1 g. How do you find the MOI of the rod/mass complex

Thanks!

Welcome to the PF. Hope you're feeling better.

This resource should help you out:

http://en.wikipedia.org/wiki/Moment_of_inertia

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FAQ: How Do You Calculate the MOI for a Rod with a Mass Attached?

What is the purpose of finding the MOI of a rod/mass complex?

The purpose of finding the MOI (Moment of Inertia) of a rod/mass complex is to understand and analyze the object's resistance to rotational motion. This information is important in various fields of science and engineering, such as designing machinery and predicting the behavior of rotating objects.

What equipment is needed to perform this experiment?

To find the MOI of a rod/mass complex, you will need a meter stick, a stopwatch, a pivot point (such as a nail or pencil), and various masses to attach to the rod.

How do you calculate the MOI of a rod/mass complex?

The MOI of a rod/mass complex can be calculated by using the formula I = MR², where I is the moment of inertia, M is the mass of the object, and R is the distance from the pivot point to the center of mass. In this experiment, multiple masses will be added at different distances from the pivot point, and the moment of inertia will be calculated for each configuration.

What factors can affect the accuracy of the results?

The accuracy of the results can be affected by various factors, such as air resistance, friction at the pivot point, and human error in taking measurements. It is important to minimize these factors as much as possible to obtain more accurate results. Additionally, using a larger sample size and performing multiple trials can help reduce the impact of these factors.

What are some real-world applications of knowing the MOI of a rod/mass complex?

The knowledge of MOI is useful in various real-world applications, such as designing vehicles, calculating the stability of structures, and predicting the behavior of rotating objects, such as satellites or gyroscopes. It is also important in fields such as sports, where knowing the MOI of a bat or a golf club can affect performance. Additionally, it is used in physics and engineering courses to understand the principles of rotational motion.

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