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195 Angular Momentum

# 195 Angular Momentum - PHYSICS 195 LAB Angular Momentum...

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PHYSICS 195 LAB:   Angular Momentum                                                                 Page 1 of 11 SAN DIEGO MESA COLLEGE NAME _________ PHYSICS 195A LAB REPORT DATE TIME GROUP # PARTNERS___________________ _____________________________ _____________________________ TITLE: Angular Momentum OBJECTIVE: An exercise in the conservation of Angular Momentum and rotational kinetic energy in various types of angular collisions. THEORY: I. Basic definition of angular momentum for a particle (with diagram): o L = P R × L = RP sin θ II. Angular momentum of a rigid body about a fixed axis: o L = I o ϖ III. Angular momentum defined in analogy to Newton's Second Law: dt L d dt P d F o ext o ext = = τ IV. Conservation of angular momentum: if 0 = ext o τ , then 0 = dt L d o thus f o L L =

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PHYSICS 195 LAB:   Angular Momentum                                                                 Page 2 of 11 PART I: INELASTIC COLLISIONS EXPERIMENTAL TECHNIQUES: ( we will use both steel disks ) A. The rotational inertia of each steel disk is calculated from the physical measurements of their inner and outer diameters, and masses. Take care to not scratch the disk surfaces! B. The apparatus is set up, cleaned and leveled in the same manner as the previous experiment. The bottom air hose must be clamped . The two steel disks are used with the "drop pin" (long black-capped pin), so that each disk rotates smoothly and independently. C. The first collision is accomplished by holding the bottom disk stationary and spinning the top disk (300-400 bars/s). Note: do not exceed 400 bars/s in today’s lab . Record the reading for the top disk and immediately pull the pin. Wait for two seconds, then record the reading for the common velocity of the two disks after the collision. Repeat this process for a total of three collisions. Record each collision in your data table. Note the two-second delay in recording the final reading, due to the nature of the optical reader.
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