8 free physics calculators from the Chemistry Calculator Suite. Each one opens directly, with no login.
Enter the orbit number n and the atomic number Z to get the radius rₙ and the energy Eₙ of that Bohr orbit, for hydrogen or any hydrogen-like ion.
Find the electrostatic force between two point charges from F = kq₁q₂/r², with the charges in coulombs and the separation in metres.
Calculate force, kinetic energy, potential energy and work from whichever pairs of mass, acceleration, velocity, height, force and distance you know (g = 9.80665 m/s²).
Solve the equations of uniformly accelerated motion: enter any three of u, v, a, t and s and the remaining two are worked out.
Two modern-physics results in one tool: the de Broglie wavelength of a particle from its mass and velocity, and the energy of a photon from its wavelength.
Enter any two of voltage, current and resistance to get the third from V = IR, together with the power dissipated.
Solve the lens or mirror formula for focal length, object distance or image distance in centimetres, using the sign convention — leave one value blank.
Solve v = fλ for wave speed, frequency or wavelength from the other two. One button sets v to the speed of light for electromagnetic waves.