# ROTATIONAL MOTION - Yong1 ROTATIONAL MOTION PHYSICS LAB...

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Yong1 ROTATIONAL MOTION PHYSICS LAB REPORT (6) – 07/29/2015 Instructor: Qusai Al-shidi Objective
Yong2 By applying known torques to a system, which is free to rotate, the resulting angular acceleration will be measured and used to determine the moment of inertia of the system. Results Data for Moment of Inertia Calculation: Radius spindle , r = 0.0171 m Mass of Platter , M= 0.005 kg Diameter of Platter , D = 0.1135 m Radius of Platter , R = 0.0567 m I (disc) = 1 2 M R 2 = 8.0 × 10 6 kgm 2 Frictional torque = -0.074 (N.m) Data for Moment of Inertia Measurement: Applied Mass m (kg) Angular Acceleration ( rads s 2 ) Cord Tension ( N ) Applied Torque ( N .m ) 0.0350 0.246 0.343 0.0059 0.0400 0.461 0.392 0.0067 0.0450 0.529 0.441 0.0075 0.0500 0.592 0.490 0.0084 0.0550 0.653 0.539 0.0092 0.0600 0.720 0.588 0.0100 0.0650 0.779 0.637 0.0109 Analysis The laws that govern the rotational motion follow from the Newton’s laws just as do those, which govern linear motion. If an object is rotating about a fixed axis, then newton’s law describing its rotational motion can be expressed as: τ = τ = torque I = Moment of Inertiaα = angular acceleration
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