# Some students had difficulty interpreting negative energies.

## Some students had difficulty interpreting negative energies.

- I: For a classical system...are there any values of the total energy that the particle in the system could not have?
- S: In a classical system, we can not have negative energies, so you can have anything greater than or equal to zero but not anything less. Classically.
- S': ...total energy is going to be ... has to be positive [later accepts request to draw a negative energy and interprets motion and probability approximately correctly]
- S'':...the whole thing with negative energy was funny to me.