OCR Physics Energy Revision Notes

• 1Energy cannot be created or destroyed, only transformed (Law of Conservation of Energy).
• 2Kinetic energy is the energy of motion, calculated as KE = 0.5mv².
• 3Potential energy is stored energy based on position, commonly gravitational potential energy (PE = mgh).
• 4Energy efficiency measures how much useful energy is obtained from a system compared to the energy input.
• 5Power is the rate at which energy is transferred or converted, measured in watts (1 watt = 1 joule/second).

Energy is what makes things happen; it's what allows objects to move or change. There are different types of energy, like kinetic energy, which is energy of moving objects, and potential energy, which is stored energy based on an object's position. Energy can change from one form to another, but the total amount of energy in a closed system always stays the same.