Script

The final script is done for our presentation...click here

physical model is also finished.

Media Work

Today we searched and found a video that we may be using for calculating the Centripetal Force...

 

Shawn Johnson--Uneven Bars--2008 Visa Championship

 

Also, we began to apply the idea of Centripetal Force to this video, and how it would work.

 

We will be meeting out of class to calculate the Centripetal Force and make a presentation, then finish up our posterboard and media presentation.

Being Productive

Today we made plans for our layout of the multimedia presentation, the trifold poster board, and physical model. We have begun our process for printing and  setting things up.
All and all a very productive day!

Angular Momentum

Angular Momentum is equal to the product of mass, velocity, and distance from mass to axis rotation. Another equation for angular momentum is the moment of inertia multiplied by the angular velocity. Angular momentum is not gained or lost from the time the gymnasts pushes off the mat. However, gymnasts are able to change their rate of rotation. They do this by changing their center mass of pulling in their arms or vice versa to perform tricks without pushing off of anything.

Friction

Friction is the rubbing of two surfaces against each other. On the uneven bars the gymnasts use angular friction. Angular friction is found by coefficient multiplied by the two friction surfaces. By using chalk, it helps increase friction when the chalk absorbs sweat. Chalk also helps the gymnasts glide around the bar and helps prevent their hands from sticking to the bar.

Acceleration

Acceleration

 

 

Centripetal Acceleration = velocity squared / radius

 

 

The radius would be equal to the gymnast's height. Being short is favorable in gymnastics because it would make the radius smaller. Therefore, making the acceleration larger. Sometimes gymnasts will do the splits while swinging, reducing the radius and giving them a extra boost of speed. This speed is needed to switch bars and do certain tricks.

New Perspective

This week we decided that we're going to do a more theoretical perspective on the physics of uneven bars, then go into detail on one aspect.

Through a theoretical stand point we will address momentum, acceleration, velocity, and friction.

We will be collecting physical data and going in-depth with centripetal force.

Our decision to take a more theoretical perspective was inspired by this presentation:

http://prezi.com/pk5rhd6et9nn/physics-in-uneven-bars/

In summary, we will still be studying all the basic physics of uneven bars, but only gathering numbers for centripetal force.