Mock equations Flashcards
relationship between speed, distance and time
average speed= distance moved / time taken
equation for acceleration
acceleration= change in velocity / time taken
equation for force
force = mass x acceleration
equation for weight
weight = mass x gravitational field strength
equation for moments
moment = force x perpendicular distance
equation for power
power = current x voltage
equation for voltage
voltage = current x resistance
equation for charge
charge = current x time
equation for energy transferred (with charge and voltage)
energy = charge x voltage
OR
energy= current x time x voltage
equation for wave speed
wave speed = frequency x wavelength
equation for frequency
frequency = 1 / time period
equation for refractive index
refractive index = sin(angle of incidence) / sin(angle of refraction)
relationship between critical angle and refractive index
sin(critical index) = 1/ refractive index
equation for energy efficiency
efficiency = useful energy output/ total energy input x 100%
equation for work done/energy transferred (with force and distance)
work done = force x distance moved
equation for gravitational potential energy
GPE = mass x gravitational field strength x height
equation for kinetic energy
kinetic energy = 1/2 x mass x speed2 (squared)
equation for density
density = mass / volume
equation for pressure
pressure = force / area
equation for pressure difference
pressure difference = height x density x gravitational field strength
equation for change in thermal energy
change in thermal energy = mass x specific heat capacity x change in temp
relationship between pressure and kelvin temp (of a fixed mass of gas at constant volume)
P1 / T1 = P2 / T2
(T = temp)
relationship between pressure and volume (of a fixed mass of gas at constant temp)
P1V1 = P2V2
relationship between input and output voltages and No_ turns for a transformer
input (primary) voltage / output (secondary) voltage = primary turns / secondary turns
relationship between input and output power in transformers (and condition for it to work)
input power = output power
primary voltage x primary current = secondary voltage x secondary current
for 100% efficiency
orbital speed equation
orbital speed = (2 x Π x orbital radius) / time period
equation relating wavelength, velocity of a galaxy and speed of light
change in wavelength / wavelength in reference galaxy = velocity of galaxy / speed of light
