Phys4AS17 AAChung

Lab 18: Moment of Inertia and Frictional Torque Amy, Chris, and John May 22, 2017 In today's lab, we will determine the time for the cart as it travels down a ramp one meter. The cart will experience tension from the metal disk as the metal disk rotates.  Theory:  There are many components happening in this lab. In order to find the time the cart travels one meter, our theory is to relate the tangential acceleration of the metal disk is equal to the acceleration of the cart. Let's first look at the metal disk. As the metal disk rotates from the pull of the cart, the metal disk is experiencing two different types of torques. The first torque is the tension force from the cart. The second torque the metal disk will be experiencing is the frictional torque. We will sum these torques to equal moment of inertia of the disk and the angular acceleration. Instead of the spring applying torque on the outer rim of the disk, it will be applying, it will be applying torque in...

Lab 16: Angular Acceleration Amy, Chris, and John May 15, 2017 In today's lab we figured out the factors that make angular acceleration in our rotating disk with a Pasco air sensor set up, and also to apply our knowledge using calculations of torque. With this data we measured the values for moments of inertia for the second part of the lab where we factor in minute values for torque.  Theory:  Torque is calculated as the moment arm from the axis of rotation, I is the moment of inertia of a rotating object, and alpha is angular acceleration.  Where the delta r is the moment arm from the axis of rotation, I is the moment of inertia of the rotating object, and alpha is the angular acceleration. Our setup for the lab allows us to apply a known force (gravitational force from hanging mass) which rotates our pulley and disk system. Friction is reduced significantly by using air between the rotating tracks. For the first part of our experiment, we use LoggerPr...