Equations
Equations
Ask Physics knows 111 equations. Every one has a source and a license, and Noether checks that its units balance before it is allowed in.
Kinematics
- Average speed:
avg_speed - Centripetal acceleration:
centripetal_acceleration - Displacement from average velocity (constant acceleration):
kin_x_avg_velocity - Displacement-time relation (constant acceleration):
kin_x_at - Maximum height of a vertical launch:
vertical_launch_height - Speed from angular velocity:
tangential_speed - Speed in uniform circular motion from the period:
circular_speed_period - Time to reach the peak of a vertical launch:
vertical_launch_time - Velocity-displacement relation (constant acceleration):
kin_v_squared - Velocity-time relation (constant acceleration):
kin_v_at
Dynamics
- Centripetal force:
centripetal_force - Hooke's law:
hookes_law - Kinetic friction:
kinetic_friction - Maximum static friction:
static_friction_max - Moment of inertia of a point mass:
moment_of_inertia_point - Newton's second law:
newton_second_law - Newton's second law for rotation:
newton_second_rotation - Torque from a perpendicular force:
torque - Weight near a planet's surface:
weight
Energy
- Average power:
power_work_time - Efficiency:
efficiency - Elastic potential energy of a spring:
spring_potential_energy - Gravitational potential energy near a surface:
gravitational_pe - Kinetic energy from momentum:
kinetic_energy_momentum - Power from force and speed:
power_force_velocity - Rotational kinetic energy:
rotational_kinetic_energy - Translational kinetic energy:
kinetic_energy - Work done by a constant force:
work_constant_force - Work-energy theorem:
work_energy_theorem
Momentum
- Angular momentum of a rigid body:
angular_momentum - Impulse:
impulse - Impulse-momentum theorem:
impulse_momentum - Linear momentum:
momentum - Perfectly inelastic collision (momentum conservation):
inelastic_collision - Recoil from rest (momentum conservation):
recoil
Gravitation
- Escape speed:
escape_velocity - Gravitational acceleration near a body:
surface_gravity - Gravitational potential energy (magnitude, any distance):
gravitational_pe_universal - Kepler's third law (circular orbit):
kepler_third_law - Newton's law of universal gravitation:
newton_gravitation - Speed of a circular orbit:
orbital_speed
Fluids
- Buoyant force (Archimedes' principle):
buoyant_force - Continuity equation:
continuity_equation - Density:
density - Pressure:
pressure - Pressure at depth (gauge):
hydrostatic_pressure - Volume flow rate:
volume_flow_rate
Thermodynamics
- Average kinetic energy of a gas molecule:
molecular_kinetic_energy - Carnot efficiency:
carnot_efficiency - First law of thermodynamics:
first_law - Heat for a phase change:
latent_heat - Heat for a temperature change:
specific_heat - Ideal gas law:
ideal_gas_law - Ideal gas law (number of molecules):
ideal_gas_molecules - Linear thermal expansion:
linear_expansion - Power radiated by a black body:
stefan_boltzmann - Power radiated by a real surface:
stefan_boltzmann_emissivity - Rate of heat conduction:
heat_conduction - Root-mean-square speed of gas molecules:
rms_speed - Work of a heat engine:
heat_engine_work
Waves
- Angular frequency:
angular_frequency - Doppler effect (source approaching a still observer):
doppler_approaching - Fundamental frequency of a string fixed at both ends:
string_fundamental - Intensity of a point source:
sound_intensity - Period and frequency:
period_frequency - Period of a mass on a spring:
spring_mass_period - Period of a simple pendulum:
pendulum_period - Speed of sound in an ideal gas:
sound_speed_ideal_gas - Wave speed:
wave_speed - Wave speed on a string:
string_wave_speed
Optics
- Image height from distances:
lens_magnification - Index of refraction:
refractive_index - Lens magnification:
magnification_ratio - Optical power of a lens:
lens_power - Thin lens equation:
thin_lens
Electricity and magnetism
- Average emf when a field through a coil switches off:
faraday_average_emf - Capacitance:
capacitance - Charge from current and time:
charge_current_time - Coulomb's law:
coulomb_law - Electric field of a point charge:
point_charge_field - Electric potential of a point charge:
point_charge_potential - Electric power:
electric_power - Energy stored in a capacitor:
capacitor_energy - Energy stored in an inductor:
inductor_energy - Force on a charge in an electric field:
electric_force_field - Ideal transformer:
ideal_transformer - Magnetic field inside a long solenoid:
solenoid_field - Magnetic field of a long straight wire:
wire_magnetic_field - Magnetic force on a current-carrying wire:
magnetic_force_wire - Magnetic force on a moving charge:
magnetic_force_charge - Motional emf:
motional_emf - Ohm's law:
ohms_law - Parallel-plate capacitor in vacuum:
parallel_plate_capacitor - Parallel-plate capacitor with a dielectric:
dielectric_capacitor - Potential difference in a uniform field:
uniform_field_potential - Power dissipated in a resistor (current):
power_current_resistance - Power dissipated in a resistor (voltage):
power_voltage_resistance - Radius of a charge's circular path in a magnetic field:
cyclotron_radius - RC time constant:
rc_time_constant - Resistance of a wire:
resistivity - Two resistors in parallel:
parallel_resistors - Two resistors in series:
series_resistors
Modern physics
- de Broglie wavelength:
de_broglie - Length contraction:
length_contraction - Lorentz factor:
lorentz_factor - Mass-energy equivalence:
mass_energy - Momentum of a photon:
photon_momentum - Photoelectric effect:
photoelectric_effect - Photon energy from frequency:
photon_energy - Photon energy from wavelength:
photon_energy_wavelength - Time dilation:
time_dilation