Work, power, kinetic and potential energy, and the efficiency formula eta = MA/VR

What this note covers

1. Work requires force acting through displacement
2. Power measures the rate of energy transfer
3. Kinetic and potential energy describe different stored mechanical energy
4. Efficiency compares useful output with a defined input
5. Electrical input can be checked against mechanical output
6. An energy ledger makes integrated questions manageable
7. Worked energy ledger: battery input to lifted load
8. Worked machine audit: MA/VR agrees with work efficiency

8 sections · 10 key terms & formulas · 6 common mistakes