4 Main categories if it comes to Physics
If you get confused by the A to Z-List, try to search through those main categories.
Mechanics & Kinematics
Speed, distance, and time: Calculating v=s/t (a classic for everyday questions).
Free fall & acceleration: How fast does an object fall after a certain amount of time?
Kinetic & potential energy: Energy calculations based on mass and speed or height.
Electricity
Ohm’s Law: Calculating voltage ($U$), current ($I$), and resistance ($R$). Electrical power: How many watts does a device consume ($P = U \cdot I$)? Resistor circuits: Series and parallel connections of resistors.
Thermo-dynamics
Temperature conversion: Quickly convert between Celsius, Fahrenheit, and Kelvin. Thermal energy (heating energy): Calculation of the energy required to heat substances ($Q = m \cdot c \cdot \Delta T$). Thermal expansion: How much does a material expand when heated?
Optics and Wave Theory
Refractive index (Snell’s law of refraction): How light is refracted when passing from one medium to another. Wavelength and frequency: Relationship between light or sound waves, speed, and frequency ($\lambda = c / f$). Lens equation: Optically determining focal length, object distance, and image distance.