"Is it possible to create perpetual motion on earth or in space? If you put a pendulum in a complete vacuum and swung it, would it create perpetual motion?"
-Adam (age 13)
Volume Change When Salt Dissolves
Decimal Expansion Of E
Equations For Quantum Gravity
Testing Series-wired Christmas Tree Lights
Why Do Excited States Decay?
Weight Of Materials On A Rocket
Base Physical Quantities
Mixing Distilled And Tap Water
6913 questions have been answered online since 1998 by volunteers from the Department of Physics at the University of Illinois' Physics Van outreach program. We've tried hard to make this the most reliable physics Q&A site on the Web, but no site is perfect, as we explain on this note. Our Baloney feature provides examples of how shaky many other sites are.
If you'd like to ask us a new question, not already covered, please read our answering guidelines first. We try to answer as many questions as we can, but it's not always possible to answer them all. Questions from kids are especially welcome.
Although we recommend not using our informal site as a cited reference, students who are in a rush and can't find a more proper peer-reviewed source can check our citation information section.