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# Physics Equations

### Physics Equations for IGCSE 9-1 2019

Equation with speed, time and distance ? Average speed= Distance moved/ Time taken
Equation with velocity, acceleration, and time Acceleration= Change in velocity / Time taken
Equation with Force, mass and acceleration Force= Mass x Acceleration
Equation with weight, gravitational field strength and mass Weight= Mass x Gravitational field strength
Equation with perpendicular distance from the pivot, moments and force Moment= Force x Perpendicular distance from the pivot
Equation with power, current and voltage Power= Current x Voltage
Equation with Voltage, Resistance and Current Voltage= Current x Resistance
Equation with Charge, Current and Time Charge= Current x Time
Equation with wavelength, wave speed and frequency Wave speed= Frequency x Wavelength
Equation for Refractive index Refractive index =sin i/ sin r
Equation with useful energy output, total energy input and efficiency Efficiency = useful energy output / total energy input
Equation with work done, force and distance moved Work Done = Force x Distance moved
Equation with GPE, mass, height and g Gravitational Potential Energy = mass x g x height
Equation for Kinetic Energy Kinetic energy = 1/2 x mass x speed² (speed is squared)
Equation with energy transferred and work done Energy Transferred = Work done
Equation with volume, density and mass Density = Mass / Volume
Equation with pressure, area and force Pressure= Force / Area
Equation with pressure difference, height, density and g Pressure Difference = Height x Density x g
Equation with input voltage, output voltage and primary and secondary turns Input (primary) Voltage/ Output (secondary) Voltage = Primary turns/ Secondary turns
Equation with input and output power Input Power = Output Power (for 100% efficiency)
Equation with Momentum, Velocity and Mass Momentum= Mass x Velocity
Equation with Momentum, Force Acting and Time Taken Force Acting= Change in Momentum/ Time Taken