Stage: 4 Challenge Level: 
Rigid Bodies. Making and proving conjectures. Moment of a force. Hooke's law/Elastic strings and springs. Games. Mathematical reasoning & proof. Stability and oscillations. Interactivities. Small software. Centre of mass.
Published .
Copyright © 2007. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project, which also includes the Plus and Motivate sites.
email: nrich@damtp.cam.ac.uk