BRAINCAKEPrinciple of Conservation of Energy
Energy is the capacity to do work.
Energy is a scalar quantity. The SI unit for energy is the joule.
The energy of systems with mass are kinetic energy and gravitational potential energy. Potential energy is stored energy.
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Key terms in this lesson
- scalar quantity
- A quantity that has magnitude only, with no direction.
- friction
- A force that arises when two surfaces in contact move, or try to move, relative to each other, acting to oppose the relative motion.
- kinetic energy
- The energy an object possesses due to its motion.
- gravitational potential energy
- The energy an object possesses due to its position in a gravitational field.
- closed system
- A system of interacting objects on which no external forces act.
More in Work, Energy and Power
- Work Done and Energy
- Work Done at and Angle to Motion
- Forms of Energy
- Kinetic Energy
- Gravitational Potential Energy
- Energy Transfer
- Power
- Power and Motion
All 10 lessons in Work, Energy and Power · All OCR AS-level Physics topics