Circular Orbital Speed
mechanics · gravitation
Gives circular-orbit speed around a spherical mass in the two-body approximation.
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Escape Speed
mechanics · gravitation
Gives the minimum ideal launch speed to escape a spherical mass from radius r.
Hooke's Law
mechanics · periodic motion
Models the restoring force of an ideal linear spring.
Spring Potential Energy
mechanics · periodic motion
Gives energy stored in an ideal linear spring.
Mass–Spring Period
mechanics · periodic motion
Gives the period of an ideal mass–spring oscillator.
Simple Pendulum Period
mechanics · periodic motion
Gives the period of a small-angle simple pendulum.
Frequency and Period
mechanics · periodic motion
Relates the number of cycles per time to one-cycle duration.
Density
mechanics · fluids
Relates mass to occupied volume.
Pressure
mechanics · fluids
Relates a normal force to the area over which it acts.
Pressure in a Static Fluid
mechanics · fluids
Gives pressure at depth h in a fluid of uniform density.
Buoyant Force
mechanics · fluids
Gives buoyant force from displaced fluid volume.
Volume Continuity Equation
mechanics · fluids
Relates cross-sectional area and speed in steady incompressible flow.
Bernoulli's Equation
mechanics · fluids
Relates pressure, elevation, and speed along a streamline.
Linear Thermal Expansion
thermal physics · thermal expansion
Approximates length change from a temperature change.
Sensible Heat
thermal physics · calorimetry
Relates heat transfer to mass, specific heat capacity, and temperature change.
Latent Heat
thermal physics · calorimetry
Relates phase-change heat transfer to mass and specific latent heat.
Ideal Gas Law
thermal physics · gas laws
Relates pressure, volume, amount of gas, and absolute temperature for an ideal gas.
Molecular and Molar Constants
thermal physics · gas laws
Relates molar and molecular forms of the gas constant.
Average Molecular Kinetic Energy
thermal physics · kinetic theory
Gives mean translational kinetic energy per ideal-gas molecule.
Thermal Conduction Rate
thermal physics · heat transfer
Gives steady heat-transfer rate through a uniform material.
Stefan–Boltzmann Law
thermal physics · heat transfer
Gives net radiative power exchange for an idealized radiating surface.
Wien's Displacement Law
thermal physics · heat transfer
Relates a blackbody peak wavelength to absolute temperature.
First Law of Thermodynamics
thermal physics · thermodynamics
Relates internal-energy change to heat and work under the source convention.
Entropy Change for Reversible Heat Transfer
thermal physics · thermodynamics
Relates entropy change to reversible heat transfer at temperature T.
Ideal Heat-Engine Efficiency
thermal physics · thermodynamics
Gives the maximum ideal efficiency between hot and cold thermal reservoirs.