Phys4AS17 jsong

Purpose: Learn the angular acceleration. Find out how the changing of hanging mass, rotating mass and the torque radius will influence on the angular acceleration. Introduction: In the angular acceleration lab, we usually use a disk. The changing of hanging mass, rotating mass and the torque radius affect on the angular acceleration. By changing one of those parameters and remaining others, we can find out how the chosen parameter will change the angular acceleration. For example, we can derive the influence of radius change by change the pulley’s size, which is made of the same material. After determining every parameters, we can finally find out how the changing of hanging mass, rotating mass and the torque radius will influence on the angular acceleration and verify it by the equation I*α=Torque where α stands for the angular acceleration. Setup: Set experiment devices as the following photo. Procedure: Measure the required parameters. Here are these para...

Purpose: Determine the firing speed of a ball from a spring-loaded gun. Introduction: In this ballistic pendulum lab, a ball is fired into a nylon block, which is supported by four vertical strings. The ball is captured by the block and they rise together through some angle. Use the equipment find out the angle. The kinetic energy of the system including block and ball transfers into gravitational potential energy during this process. So by measuring the angle we can derive the initial kinetic energy and finally, the speed. Procedure: First measure and record the mass of the ball and the block. Then set the ballistic pendulum up as following. After setting up, level the apparatus and the block. After all preparation done, pull back and lock the spring into position. Zero the angle indicator. Then put the ball into position. Then fire the ball into the block and record the maximum angle. Repeat these steps by four to five times to get a reliable average value. Cal...

Purpose: Look at a two-dimensional collision between two steel balls or steel and glass ball and determine if momentum and energy are conserved. Theory: An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter. In this lab we will determine if the momentum and energy are conserved after collision by checking the data collected by the video. The momentum conserve both on the x-axis and the y-axis. So we can determine the change of the momentum in a two-dimensional collision by checking the total momentum in each direction. Setup: Set the stationary ball on a leveled glass table. Aim the rolling ball so that it hits the side of stationary ball. Use the phone’s slow motion capture function to collect data as a camera. Steel ball and steel ball: We firstly use two steel balls. After getting data from the phone, we use LoggerPro to analyze...