Equations Flashcards
What is the equation that links distance travelled, average speed and time?
distance travelled = average speed × time
d = s x t
What is the equation that links acceleration, change in velocity and time taken?
acceleration = change in velocity ÷ time taken
a = (v – u)
t
What is the equation that links force, mass and acceleration?
force = mass × acceleration
F = m × a
What is the equation that links weight, mass and gravitational field strengh?
weight = mass × gravitational field strength
W = m × g
What is the equation that links momentum, mass and velocity? (Higher)
momentum = mass × velocity
p = m × v
What is the equation that links work done, force and distance moved in the direction of the force?
work done = force × distance moved in the direction of the force
E = F x d
What is the equation that connects kinetic energy, mass and velocity?
kinetic energy = ½ × mass × (velocity)2
KE = ½ × m × v2
What is the equation for efficiency?
(useful energy transferred by the device)
(total energy supplied to the device)
What is the equation that links gravitational potential energy, mass, gravitational field strength and change in vertical height?
gravitational potential energy = mass × gravitational field strength x change in vertical height
ΔGPE = m × g × Δh
What is the equation that links wave velocity, frequency and wavelength?
wave velocity = frequency x wavelength
v = f x λ
What is the equation that connects wave speed, distance and time?
wave speed = distance
time
v = d
t
What is the equation that connects power, work done and time taken?
power = work done ÷ time taken
P = E
t
What is the equation for moment of a force?
moment of a force = force × distance normal to the direction of the force
What is the equation that connects charge, current and time?
charge = current × time
Q = I x t
What is the equation that connects energy transferred, charge moved and potential difference?
energy transferred = charge moved × potential difference
E = Q × V
What is the equation that connects potential difference, current and resistance?
potential difference = current × resistance
V = I x R
What is the equation that connects electrical power, current and potential difference?
electrical power = current × potential difference
P = I x V
What is the equation that connects electrical power, current and resistance?
electrical power = current squared × resistance
P = I2 x R
What is the equation that links density, mass and volume?
density = mass ÷ volume
ρ = m
V
What is the equation that links force exerted on a spring, spring constant and extension?
force exerted on a spring = spring constant × extension
F = k × x
What is the equation that links pressure, force normal to a surface and area of surface?
pressure = force normal to surface ÷ area of surface
P = F
A
What is the equation that links final velocity, initial velocity, acceleration and distance?
(final velocity)2 – (initial velocity)2 = 2 × acceleration × distance
v2 – u2 = 2 × a × x
What is the equation that links force, change in momentum and time? (Higher)
force = change in momentum ÷ time
F = (mv – mu)
t
What is the equation that links energy transferred, current, potential difference and time?
energy transferred = current × potential difference × time
E = I x V x t
What is the equation that connects force on conductor at right angle to a magnetic field carrying a current, magnetic flux density, current and length? (Higher)
force on conductor at right angle to a magnetic field carrying a current = magnetic flux density × current × length
F = B × I × L
Voltage across primary coil = ?
Voltage across secondary coil
voltage across primary coil = number of turns in primary coil
voltage across secondary coil number of turns in secondary
Vp = Np
Vs Ns
(pd × current) in primary coil = ?
(pd × current) in primary coil = (pd × current) in secondary coil
Vp × Ip = Vs × Is
What is the equation that connects change in thermal energy, mass, specific heat capacty and change in temperature?
change in thermal energy = mass × specific heat capacity × change in temperature
ΔQ = m × c × Δθ
What is the equation that links thermal energy for a change of state, mass and specific latent heat?
thermal energy for a change of state = mass × specific latent heat
Q = m × L
How do you calculate pressure or volume for gases of fixed mass at a constant temperature?
P1 x V1 = P2 x V2
Energy transferred in stretching = ?
energy transferred in stretching = 0.5 × spring constant × (extension)2
E = ½ × k × x2
What is the equation that links pressure due to a column of liquid, height of column, density of liquid and gravitational field strengh?
pressure due to a column of liquid =
height of column × density of liquid × gravitational field strength
P = h × ρ × g
