Average speed
Average speed=distance/time
Acceleration
Acceleration=change in velocity/time taken
Force
Force=mass x acceleration
Weight
Weight = mass x Grav field strength
Electrical power
Power= current x voltage
Charge
Charge =current x time
Voltage
Voltage = current x resistance
Gravitational potential energy
GPE = m x g x h
Kinetic energy
1/2 x m x v^2
Density
Mass / volume
Pressure
Force/area
Pressure difference
Height x density x g
Wave speed
Frequency X wavelength
Frequency
1/time
Angle of incidence
Angle of reflection
Refractive index
Speed of light in a vacuum/speed of light in that material
Snell’s law
N = sin I/sin r
Critical angle
Sin C= 1/n
Efficiency
Useful energy output/total energy input
Work done
Force X distance moved
Power
Work done/time taken
Kinetic energy gained
Gravitational potential energy lost
Fixed mass of a gas at a constant temperature
Pressure X volume = constant
Fixed mass of a gas at a constant temperature
P1v1=p2v2