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# lab 8 - Physics 1AL Introduction ROTATIONAL MOTION Summer...

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Physics 1AL ROTATIONAL MOTION Summer Session II 2010 1 Introduction The purpose of this lab is to study the various aspects of rotation. You will be studying the property of rotational inertia for various shapes and sizes. Your Objective: To determine how shape, size, mass, or distribution of mass affect the motion of objects rolling down an inclined plane. ______________________________________________________________________________ Pre-lab questions: Read sections 7.1, 7.2, 7.3, 7.4, 8.5, and 8.6 in Serway & Faughn Answer each of the following questions in a few sentences of your own words: 1. Suppose you have two equal mass objects both on a gentle incline. One is a glider on an air track while the other is a ball on a straight slope. The air track and the slope have the same slope angle. You release them at the same time and at the same distance from the bottom of the slope. You note that neither loses any significant amount of energy to friction as the air track has very low friction and the ball rolls down without slipping or sliding. a) Explain what type of energy both objects have just before they are released. Do both objects initially have the same amount of energy? b) Explain what type of energy both objects have just before they reach the bottom of the slope. Do both objects have the same amount of energy when they reach the bottom of the slope? 2. Calculate the moment of inertia about a central axis (in units of kg m 2 ) for: a) a solid sphere with a mass of 75 grams and a radius of 5.0 cm. b) a thin spherical shell with a mass of 75 grams and a radius of 5.0 cm. c) a solid cylinder with a mass of 75 grams and a radius of 5.0 cm. d) a thin hoop with a mass of 75 grams and a radius of 5.0 cm. 3. Calculate the rotational kinetic energy for the following objects spinning about a central axis (in units of Joules): (Hint: the answers to question 2 may help here) a) a solid sphere with a mass of 75 grams and a radius of 5.0 cm rotating with an angular speed of 1.5 rad/sec. b) a thin spherical shell with a mass of 75 grams and a radius of 5.0 cm rotating with an angular speed of 1.5 rad/sec.

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