- #1
Drizzy
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Homework Statement
apparently momentum is only sure to be conserved in a closed system - no external forces. So that means if a toy car collides with a wall then the total momentum efter won't be the same as before. That is because the wall would
be joined to something else and ultimately to the Earth.
What exactly is a closed system with no external forces? And isn't everything on the Earth connected to earth?
2. Homework Equations
3. The Attempt at a Solution