Physics Equations Flashcards
average speed, distance and time
speed = distance/time
force, mass and acceleration
force = mass x acceleration
acceleration, change in velocity and time taken
acceleration = change in velocity/time taken
density, mass and volume
density = mass/volume
pressure, force and area
pressure = force/area
moment, force and distance from pivot
moment = force x distance from pivot
work done, force and distance
work done = force x distance moved in direction of force
energy transferred =
work done
kinetic energy, mass and speed
kinetic energy = half x mass x speed squared
gravitational potential energy (GPE), mass, gravitational field strength (g) and height
GPE = mass x g x height
efficiency, useful output and input
useful energy output/total energy input
weight, mass and gravitational field strength (g)
weight = mass x g
charge, current and time
charge = current x time
voltage, current and resistance
voltage = current x resistance
electrical power, voltage and current
power = voltage x current
wave speed, frequency and wavelength
wave speed = frequency x wavelength
refractive index (n), angle of incidence (i) and angle of refraction (r)
n = sin(i)/sin(r)
refractive index (n) and critical angle (c)
sin(c) = 1/n
pressure difference, height, density and gravitational field strength (g)
pressure difference = height x density x g
momentum, mass and velocity
momentum = mass × velocity
voltage, energy and charge
voltage = energy ÷ charge
transformer relationships
- primary voltage ÷ secondary voltage = primary turns ÷ secondary turns
- input power = output power
