Science Education Resource Center at Carleton College
Serc: Conservation of Energy of While Rolling Down a Hill
A real-life example of a ball rolling down a ramp to see whether mechanical energy really is conserved when objects roll down hills. Students analyze video clips of children rolling down a driveway on roller blades and various bikes and...
Physics Classroom
The Physics Classroom: Momentum and Its Conservation: Isolated Systems
Students learn that total system momentum is conserved for collisions occurring in isolated systems. They will find out what makes a system of objects an isolated system, and whether momentum conserved if the system is not isolated.