Lab 127 - Lab 127 Torque, Inertia and Rotational Kinetic...

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Lab 127 – Torque, Inertia and Rotational Kinetic Energy 11/10/06 Group 1: Russell Adams Pawel Bokota Vahid Hamidullah Mike Makhlouf Physics 111A TA: Ke Su ( ks265@njit.edu ) 1. - Objective Part I – To determine the rotational inertial of a rotating bodies I by measuring their angular acceleration ά and compare this measurement with the rotational inertia computed from physical measurements. Part II – Compute the energy loss of the system and compare the mechanical energy of the system at two points in time. 2. – Theory Torque: τ = Fr Where F = force, r ┴ = shortest distance between the line of F and axis of rotation O . if the force F accelerates (or tries to rotate) a body counter-clockwise the torque is positive, negative otherwise. Rotational Inertia: I = mr 2 In general: to find rotational inertia of a body you have to “slice” the body into a narrow strips of width dr (circular shape), calculate rotational inertia dI of one of them at distance r from axis of rotation O , then integrate dI all over the body. If the shape of the body can be easily described by a function then calculations are pretty
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Lab 127 - Lab 127 Torque, Inertia and Rotational Kinetic...

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