Previous Demo
Next Demo

C. Kinematics And Dynamics
Inertia - Masses Hanging In Series
Description of Demo:
: Two masses are hung in series from a fixed point alternating with three strings as photographed. When you pull downward on the third (bottom) string, which of the strings will break: the top, the middle, or the bottom string? A: It depends on how you pull. If you pull very quickly, the bottom string will break, due to the inertia of the bottom mass. If you pull slowly, the top string will break, because the weights increase the tension in the top string.

References:
Sutton, Demonstration Experiments in Physics, Demonstrations M-100. Inertial Reaction and M-101. Breaking a Rope by Sutton, Demonstration Experiments in Physics, Demonstrations M-100. Inertial Reaction and M-101. Breaking a Rope by Inertia. ◙P. LeCorbeiller, A Classical Experiment Illustrating the Notion of "Jerk," AJP 14, 64-65 (1946). ◙Frank G. Karioris, Inertia demonstration revisited, AJP 46, 710-713 (1978). ◙Steven H. Schot, Jerk: The time rate of change of acceleration, AJP 46, 1090-1094 (1978). ◙Stephen Luzader, Letter: What a Jerk!, TPT 26, 423 (1988). ◙T. R. Sandin, The Jerk, TPT 28,




Previous Demo
Next Demo


State University of New York at Stony BrookCreated & Modified by Melissa Bishop/DoIT
April 21, 2000