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Article Excerpt
8:00 MOTION OF A MAGNETOTACTIC BACTERIA **, Timothy Kurtz *(1) and Trinanjan Datta (2), (1) Department of Biology and (2) Department of Chemistry and Physics, Augusta State University, Augusta, GA 30904. We investigate the motion of magnetotactic bacteria in the presence of an external magnetic field. We explore the cases when the net torque acting on the bacteria is both zero and non-zero. Using Mathematica, we perform numerical simulations of the model bacteria system to investigate the various types of motion. In the absence of an external torque we find that the system can exhibit both a synchronous and an asynchronous motion. In the presence of a net external torque the system can exhibit oscillatory motion.
8:15 AN EXPERIMENTAL STUDY OF THE LENGTHENING PENDULUM, Seth Clark* and J. A. Hauger, Augusta State University, Augusta, GA 30904. The lengthening pendulum involves a mass oscillating at the end of a string which lengthens at a steady rate. A closed form solution exists for this system if one assumes small oscillation amplitude and ignores damping forces. We have recently measured the motion of such a pendulum using standard video techniques. A stepper motor controls the lengthening rate of the pendulum. We find that the motion of the pendulum is in close agreement with the theoretical predictions. We will present the theory, experimental techniques, and results.
8:30 PRELIMINARY RESULTS OF A ROTARY PENDULUM DESIGNED TO MEASURE THE ROLLING RESISTANCE OF PNEUMATIC TIRES **, Rebecca Sawyer * and C. Poppeliers, Augusta State University, Augusta, GA 30904. We developed a novel method to quantify the rolling resistance of pneumatic bicycle tires using a rotary pendulum. We model the damping as an elastic deformation of the tire as the wheel rotates about its axis, and is similar to the damping term in a simple harmonic oscillator. We estimate the damping parameter by a least squares fit to the analytical model using a parameter search technique. Preliminary data suggests that there is a power-law relationship between the magnitude of the damping term and...
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