equations Flashcards
equation linking average speed, distance moved and time taken
average speed = distance moved/time taken
s = d/t
equation linking acceleration, change in velocity and time taken
acceleration = change in velocity/time taken
equation linking force, mass and acceleration
force = mass x acceleration
f = ma
equation linking weight, mass and gravitational field strength
weight = mass x gravitational field strength
w = mg
equation linking moment, force and perpendicular distance from the pivot
moment = force x perpendicular distance from the pivot
equation linking power, current and voltage
power = current x voltage
P = IV
equation linking energy transferred, current, voltage and time
energy transferred = current x voltage x time
E = IVt
equation linking voltage, current and resistance
voltage = current x resistance
V = IR
equation linking charge, current and time
charge = current x time
Q = It
equation linking energy transferred, charge and voltage
energy transferred = charge x voltage
E = QV
equation linking wave speed, frequency and wavelength
wave speed = frequency x wavelength
equation linking frequency and time period
frequency = 1/time period
f = 1/T
equation linking refractive index, angle of incidence and angle of refraction
n = sin i/sin r
equation linking critical angle and refractive index
sin c = 1/n
equation for efficiency
efficiency = useful energy output/total energy output x 100
equation linking work done, force and distance moved
work done = force x distance moved
W = Fd
equation linking gravitational potential energy, mass, gravitational field strength and height
gravitational potential energy = mass x gravitational field strength x height
GPE = mgh
equation for kinetic energy
kinetic energy = 1/2 x mass x speed^2
KE = 1/2 x m x v^2
equation linking power, work done and time taken
power = work done/time taken
P = W/t
equation linking density, mass and volume
density = mass/volume
equation linking pressure, force and area
pressure = force/area
p = F/A
equation linking pressure difference, height, density and gravitational field strength
pressure difference = height x density x gravitational field strength
p = h x ρ x g
whats the relationship between pressure and kelvin temperature?
p1/T1 = p2/T2
whats the relationship between pressure and volume of a fixed mass of gas at constant temperature?
p1v1 = p2v2
what’s the relationship between input (primary) and output (secondary) voltages and the turns ration for a transformer?
input (primary) voltage/output (secondary) voltage = primary turns/secondary turns
what’s the relationship between input power and output power
input power= output power
VpIp = VsIs for 100% efficiency
equation for orbital speed
orbital speed = 2pi x orbital radius/time period
equation relating change in wavelength, wavelength, velocity of a galaxy and speed of light
change in wavelength/wavelength of reference galaxy = velocity of galaxy/speed of light
