lab5a10 - Physics E-1a Expt 5a: Rotational Dynamics Fall...

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1 Physics E-1a Expt 5a: Rotational Dynamics Fall 2010 Introduction Preparation: Before coming to lab, read this lab handout and the suggested reading in Giambattista (through Chapter 8 especially sections 8.1, 8.6, 8.8, 8.9) and answer the questions in the Pre-Lab Questionnaire. Be sure to bring your completed Pre-Lab Questionnaire to lab along with this handout, writing paper, a calculator, and your copy of the Lab Companion . Post Lab Questions: For the Post Lab please hand in a copy of your calculations and results plus answers to the bold numbered questions found in sections 1, 2, and 3. Overview and Objective : The lab consists of four sections – In Section one you will experiment with a rotating chair and determine your moment of inertia. In Section two you explore conservation of angular momentum. Sections one and two require measurements and quantitative answers. In Section three you experiment with a rotating bicycle wheel and the rotating chair. In this section your answers are qualitative. Section four, which is optional, involves ‘playing’ with a precision gyroscope. You observe the interesting things that happen when a spinning object is free to move in three dimensions. Experimental Setup: For Section one the following equipment is used; A low friction rotation chair, string, a 0.5 Kg mass, a stopwatch, and a pulley. The string, mass and pulley are used to exert a constant torque on the rotating stool. In Section two, two 3.2 kilogram weights are used to change your moment of inertia while spinning on the chair. For Section three you use a spinning bicycle wheel and the rotating chair and in Section four a precision gyroscope with a gimbal mounting with a wind up motor drive. Section One. Determine your Moment of Inertia (seated on a stool). You have the following equipment: The rotation chair, a string, a mass, a stopwatch, and a pulley setup that allows a falling mass to exert a constant torque on the rotating student and stool. Choose one student in your group to perform the experiment. This student should feel comfortable spinning around and okay with a bit of momentary dizziness. 1. Now determine experimentally the combined moment of inertia of the student and the rotating chair. A weight over a pulley falling off the edge of the lab table supplies the constant force needed to change the angular momentum of the student and chair system. Your TA will demonstrate the experimental setup. 2. What is the change in potential energy of the falling weight? Explain. Hint, to keep the math simple adjust the weight so that it falls a total height of one meter.
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2 3. What is the change in rotational energy of the rotating seated student and chair? Explain.
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lab5a10 - Physics E-1a Expt 5a: Rotational Dynamics Fall...

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