Physics › Section E · Work, energy, and power › Topic E.5
Conservation of energy
Energy is never created or destroyed; it only changes form or moves from one place to another. Keeping an honest account of every form, including the heat that friction produces, solves problems that would be hard to tackle with forces alone.
In this topic
- The great bookkeeping rule
- Many forms of energy
- Joule and the nature of heat
- Energy accounting with friction
- Worked example: a sled on a snowy hill
- Worked example: friction, then a spring
- A strategy for energy problems
- Potential energy diagrams
- Efficiency
- Common mistakes to avoid
- Key takeaways
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