INVESATIGATION THE EFFECT OF SIZE AND WEIGHT ON DRAG COEFFICIENT FOR FREE FALLING OF BALLS

Abstract

The research aims to determine the drag coefficient for the free falling bodies with different size and weight using Infra Red transmitter and receiver circuits. The effects of size and weight on free falling bodies were studied. Carbon steel spheres with diameter of (0.8 – 8)mm and glass spheres with diameter of (0.5 – 17)mm, with different densities, were considered. The relation between velocity and displacement was obtained from the experimental results, the drag coefficient was calculated after the establishment of the terminal velocity for free falling bodies. The relation between drag coefficients and Reynolds number were determined and compared with results of previous work.