25 calculators

Physics & Engineering

Motion, energy, force, electricity and heat.

λ = v ÷ f0.78 mf440 Hz

Sound in air at 20 °C, 343 m/s

FForceNewton’s second law: find the force, the mass or the acceleration from the other two.Top 100 · #87vVelocityWork out a velocity from distance and time, or a final velocity from a start speed and an acceleration.PhysicsaAccelerationFind an acceleration from a change in velocity, from force and mass, or from distance and time.Top 100 · #86km/SpeedSpeed, distance or time: enter two and get the third, in the units you use.Top 100 · #85KEKinetic energyThe energy of a moving mass, or the speed or mass that gives a known energy.PhysicsPEPotential energyGravitational potential energy from mass, height and gravity, or the height or mass for a given energy.PhysicsWWorkThe work a force does over a distance, at any angle, or the force or distance behind a known amount of work.PhysicsPPowerPower is energy per second: find the power, the energy or the time from the other two.Top 100 · #88ρDensityDensity from mass and volume, or the mass or volume of a material of known density.Top 100 · #89PPressurePressure is force spread over an area: find any one of pressure, force and area.PhysicsμFrictionFriction force from the coefficient and the normal force, with the normal force worked out from a mass on a flat or sloped surface if you like.PhysicskxHooke’s lawSpring force, spring constant or extension from the other two, plus the energy stored in the spring.PhysicsJImpulseImpulse from a force over a time, or from the change in a mass’s velocity.PhysicspMomentumLinear momentum from mass and velocity, or the mass or velocity behind a known momentum.PhysicsλWavelengthThe wavelength of light, sound or any wave from its frequency and the speed of the wave in its medium.PhysicsHzFrequencyA frequency from a wavelength and wave speed, or from the period of one cycle.PhysicsΩOhm’s lawVoltage, current or resistance from the other two, with the power the circuit dissipates.Top 100 · #90ΔVVoltage dropHow many volts a cable run loses, and what percentage of the supply that is, for copper or aluminium conductors.Top 100 · #91WElectrical powerElectrical power from any two of voltage, current and resistance, with the energy it uses over time.Top 100 · #92RResistanceThe total resistance of resistors in series or parallel, or a wire’s resistance from its material, length and thickness.PhysicsCCapacitanceCapacitors in series or parallel, or the capacitance of a parallel-plate capacitor from its size and dielectric.PhysicsPVIdeal gas lawSolve PV = nRT for pressure, volume, amount of gas or temperature.PhysicsQHeat transferThe heat needed to warm a material (Q = mcΔT), or the heat flowing through a wall by conduction.PhysicsτTorqueTorque from a force on a lever arm at any angle, or the force or arm length you need for a set torque.PhysicsηEfficiencyHow much of the energy or power going in comes out as useful work, and how much is wasted.Physics