YoYo Challenge Help: Building & Materials Tips

[Smartguy]

Hey guys! I have an assignment similar to this:

http://www.physics.uwo.ca/science_olympics/events/grades_11_to_12/yo_yo_challenge.html

I don't really know how to go about building this. From looking at the nesessary equations (moment of inertia, etc.) it seems to me that the performance of the yoyo in this task is reliant upon the radius and mass of the yoyo. I'm pretty sure a larger radius will be beneficial, but I am not too sure about the mass. (we have not covered rotational motion yet so i am not an expert on how this kind of yoyo works)

I'm also not sure about what materials i should use to construct it, given that i cannot use parts of other yoyos, and they should be fairly cheap.

Any suggestions are very much appreciated...im not looking for anyone to solve the whole thing for me, just further insight into how this kind of yoyo works and how i can use this knowledge to go about building it.

Thanks

 

[factor]

Like the article says, the best teams had more mass distribution in the periphery of the object, meaning that it simulated the properties of a thin ring. Since you now have to take into account that energy conservation applies not only to kinetic energy in the form of 1/2*M*v^2 but to rotational kinetic energy in the form of 1/2*I*(omega)^2. So you need more rotational energy at the bottom so that the yo-yo "crawls" its way back up. Essentially the more moment of inertia that the yo-yo has the more power it has to go back up to its original starting point. At least this is what I believe would happen in this situation, if I'm wrong and someone sees please correct me.

 

[kyle8921]

Hello,

It's great that you are taking on this challenge and are seeking help to understand the physics behind it. As you mentioned, the performance of the yoyo in this task is dependent on its radius and mass. In order to optimize its performance, you will need to consider both of these factors carefully.

In terms of radius, a larger radius will indeed be beneficial as it will allow for a longer string length and therefore more time for the yoyo to complete the task. However, you will also need to consider the weight of the yoyo in relation to its radius. A larger radius will also increase the moment of inertia, making it more difficult to rotate the yoyo and potentially affecting its performance. Therefore, finding the right balance between radius and mass is important.

In terms of materials, it's best to use lightweight and durable materials in constructing the yoyo. This will help to minimize the overall mass of the yoyo while still ensuring its strength and stability during the challenge. Some suggestions for materials could be plastic, aluminum, or carbon fiber.

Additionally, it's important to understand the physics behind rotational motion and how it applies to the yoyo. This will help you make informed decisions when designing and building the yoyo. I would recommend doing some research on the concepts of moment of inertia, angular velocity, and torque to gain a better understanding of how these factors affect the yoyo's performance.

I hope this helps to guide you in the right direction. Remember to test and make adjustments to your design as needed, and have fun with the challenge! Best of luck.