PASCO Specialty & Mfg. ME-9847 User's Manual
Contents
1. Instruction Sheet 012 12002A PUTO IN PASCO Rotational Inertia Wands ME 9847 Grip area Grip area Included Equipment Rotational Inertia Wand Blue Rotational Inertia Wand Red Introduction The ME 9847 PASCO Rotational Inertia Wands are designed to show how the distribution of mass in an object determines the object s rotationa inertia moment of inertia The blue inertia wand has masses installed at both ends of the tube The red inertia wand has masses installed near the grip at the center of the wand Both wands have the same amount of mass so they weigh the same and feel equally heavy when lifted Theory Objects that can rotate have a tendency to resist any change in their rotation If they are at rest they tend to stay at rest If they are in motion rotating they tend to stay in motion This tendency is called rotational inertia or moment of inertia If a net torque twisting force is applied to an object that can rotate it will change the rota tion of the object The amount of change in the rotation called the angular acceleration is directly propor tional to the net torque t and inversely proportional to the rotational inertia a I The rotational inertia depends on the amount of mass in the object and the distribution of mass If the mass of an object is close to its center of rotation the rotational inertia will be smaller It will be easier to start rotating and stop rot2. ating the object If the mass is distributed far away from the object s center of rotation the rotational iner tia will be larger It will be harder to start rotating and stop rotating the object B A I aL O 800 772 8700 z www pasco com PASCO Rotational Inertia Wands Operation Operation 1 Grasp the grip area of one of the rotational inertia wands Hold the wand so that it is vertical or horizontal 2 Twist your wrist to rotate the wand back and forth Make a note of how hard or how easy it is to rotate the wand 3 Repeat with the other wand Again make a note of how hard or how easy it is to rotate the wand How does the blue wand with the masses farther from the grip area compare to the red wand with the masses nearer the grip area of the wand Technical Support For assistance with any PASCO product contact PASCO at Address PASCO scientific 10101 Foothills Blvd Roseville CA 95747 7100 Phone 916 786 3800 worldwide 800 772 8700 U S Fax 916 786 3292 Web Wwww pasco com Email support pasco com Limited Warranty For a description of the product warranty see the PASCO catalog Copyright The PASCO scientific 012 12002A PASCO Rotational Inertia Wands Instruction Sheet is copyrighted with all rights reserved Permis sion is granted to non profit educational institutions for reproduction of any part of this manual providing the reproductions are used only in their labor
3. atories and classrooms and are not sold for profit Reproduction under any other circumstances without the written consent of PASCO scientific is prohibited Trademarks PASCO PASCO scientific DataStudio PASPORT Xplorer and Xplorer GLX are trademarks or registered trademarks of PASCO sci entific in the United States and or in other countries For more information visit www pasco com legal Windows is a registered trade mark of Microsoft Corporation in the United States and or other countries Mac is a trademark of Apple Computer Inc registered in the U S and other countries 2 IZEIA
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