Free vibration ofa system is vibration that occurs in the absence of external force. An external force that acts onthe system causes forced vibrations. In this case, the exciting force continuously supplies energyto the system. Forced vibrations may be either deterministic or random (see Fig.
Of course it's your name--I learned that in 8th grade. Now for one (the first) from 7th grade and one from college (the second). 1. What do you have when you sit down and lose every time you stand up? 2. What is it that men do standing up, but women are allowed to do while sitting down? (A warning: this is suitable for mixed company, but maybe not for mixed-up company.) This is about as close as I'd come to probable offenses on this site.
1 what you do carries more weight than what you say. 2  doing is better than just speaking. 3  your actions are more significant than your words.  better to do something rather than just talk.