# NTNUJAVA Virtual Physics LaboratoryEnjoy the fun of physics with simulations! Backup site http://enjoy.phy.ntnu.edu.tw/ntnujava/

## Easy Java Simulations (2001- ) => dynamics => Topic started by: ahmedelshfie on December 06, 2010, 04:39:26 pm

 Title: Pendulum sets with different initial angle plus damping Post by: ahmedelshfie on December 06, 2010, 04:39:26 pm This applet Created by prof Hwang, modified by Ahmed.Original applet Pendulum sets with different initial angle plus damping (http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2010)This simulation show 11 pendulums with different initial angle(from minimum angle to minimum angle+angle range)It can be run in two different modes:1. $\frac{d^2\theta}{dt}=-\frac{\ell}{g}\sin\theta-b\frac{d\theta}{dt}$ (equation for real pendulum)2. $\frac{d^2\theta}{dt}\approx-\frac{\ell}{g}\theta-b\frac{d\theta}{dt}$ (equation for small angle approximation :assume $\sin\theta\approx\theta)$The damping factor b=0 is the default.You can change it and find out what will happened.For the second mode: the period and damping factor are the same for all pendulums. Do you know why?