In this lab we will be using the Rotational Inertia Demonstrator made by Arbor Scientific.
This device has a central, low friction, pulley with three different radii from which strings can be tied. It also has four thin rods that form spokes on which masses can be placed at virtually any desired position.
The moment of inertia of the central pulley, independent of the four rods and their moveable masses, is given by the manufacturer as 0.00058 kg m^{2 }. All other measurement will be taken as the experiment is completed.
In each experiment, we will ultimately be calculating the moment of inertia of the pulley and its moveable masses. We will deal with rotational (angular) kinematics properties and their relationship to linear (translational or tangential) properties of a falling mass as well as potential gravitational energy, translational kinetic energy, and rotational kinetic energy. 
Refer to the following information for the next four questions.
Before we collect any further data, we need to take measurements that will allow us to directly calculate the moment of inertia of the entire pulley assembly: central pulley, rods, and moveable masses.
Refer to the following information for the next question.
Phase I. In this part of the experiment we will wrap the string around the smallest radius of the pulley, 0.0202 meters.
You will complete three trials using a motion detector as well as the rotational inertia demonstrator. From each trial you need to record the initial time, initial height, final time, and final height. Then you will calculate the time interval and the distance required for the mass to reach the ground.

initial time 
initial height 
final time 
final height 
time interval 
distance 
linear acc 
Trial 
(sec) 
(meters) 
(sec) 
(meters) 
(sec) 
(meters) 
(m/sec^{2})

Analysis of first radius
Refer to the following information for the next question.
Phase II: In this part of the experiment we will wrap the string around the largest radius of the pulley, 0.03852 meters.
You will complete three trials using a motion detector as well as the rotational inertia demonstrator. From each trial you need to record the initial time, initial height, final time, and final height. Then you will calculate the time interval and the distance required for the mass to reach the ground.

initial time 
initial height 
final time 
final height 
time interval 
distance 
linear acc 
Trial 
(sec) 
(meters) 
(sec) 
(meters) 
(sec) 
(meters) 
(m/sec^{2})

Analysis of second radius
Refer to the following information for the next eleven questions.
Data Analysis
