Motion of Wooden Rods in Viscous Medium · IZhO 2018 #2
Physics · fluid-mechanics
Problem
Experimental Setup: Use a glass tube (inner diameter D=4.6 mm) filled with liquid gel, mounted vertically with tube pointing downward. Wooden sticks (diameter 3 mm) are inserted from below and emerge slowly upward due to buoyancy.
Part 2. Wood
1. Prove experimentally that the motion of the rod inside the tube is uniform. Measure the velocity of the rod in the gel as accurately as possible. Make error estimation of the obtained value of the velocity. To conduct this experiment, use stick of maximal length.
2. Investigate a dependence of rod velocity on its length. Plot a graph of the obtained dependence. Make error estimation of the obtained values.
3. Give a brief theoretical explanation of the result obtained in Question 2.