formulas Flashcards
What is the formula for weight, mass and gravity?
Weight(N) = mass(Kg) x gravitational field strength (N/Kg)
W = m x g
What is the formula for distance (along the line of action of the force), work done and force?
Work done = force x distance (along the line of action of the force)
What links power, work done and time?
Work done = power x time
W = P x t
What links time, current and charge?
Charge = current x time
Q = I x t
What links voltage, resistance and current?
Voltage = current x resistance
V = I x R
What links voltage, power and current?
Power = voltage x current
P = V x I
What links current, power and resistance?
Power = current squared x resistance
P = I squared x R
What links charge, energy transferred and voltage?
Energy transferred = charge x voltage?
E = Q x V
What links height, gravitational potential energy, mass and gravitational field strength
Gravitational potential energy = mass x gravitational field strength x height
Ep = m x g x h
What links momentum, velocity and mass?
Momentum = mass x velocity
p = m v
What links pressure due to a liquid, height, density of liquid and gravitation field strength?
Pressure of liquid = height x density of liquid x gravitational field strength
P = h x p x g
What links wavelength, speed and frequency?
Speed= frequency x wavelength
V= f x wavelength (lamda)
What links acceleration, initial and final velocity and time?
Acceleration = final velocity- initial / time
What links speed, time and distance?
Speed = distance over time
V = S/t
S= V x t
How to work out gradient?
Change in Y / change in X
How to work out average velocity?
(Inital + final) / 2
What links power, speed and force?
Power = force x speed
What links time period and frequency?
Frequency = 1/ time period
Time period = 1/ frequency
How do you calculate average speed?
Total distance travelled / total time taken
How do you calculate the pressure on solids?
Pressure (N/m^2) = force (N) / area (m^2)
How do you calculate a moment?
Moment (Nm) = force (N) x distance from pivot (m)
How do you calculate efficiency?
Useful energy (or power) out/ Total energy (or power) in
(x100 to get a percentage)
How to calculate mass, density and volume?
Mass = density x volume
Density = mass/volume
What links latent heat, mass and thermal energy for a change of state
E = M x L
Thermal energy for a change of state = mass x latent heat
What links change in thermal energy, specific heat capacity, mass and temperature change?
E = M x C x theta
Energy = mass x capacity x temperature
What is the formula for kinetic energy?
Ek- kinetic energy
M- mass
V- speed
Ek = 1/2 x M x V squared
What is the difference between dependent, independent and control variables?
Independent- what you change
Dependent- what you measure
Control- what you keep the same
What links resultant force, mass and acceleration?
F = ma
What links spring constant, extension and force applied to a string?
Force applied to a string = spring constant x extension
F = k e
What links acceleration, initial velocity, distance and final velocity?
(Final velocity) squared - (initial velocity) squared = 2 x acceleration x distance
What links change in momentum, force and time taken?
Force = change in momentum/ time taken
What links elastic potential energy, extension and spring constant?
Elastic potential energy= 0.5 x spring constant x (extension) squared
How to calculate magnification?
Image height / object height
What links force on a conducted carrying a current, magnetic flux density, current and length?
Force on a conductor carrying a current = magnetic flux density x current x length
F = B x I x l
What links voltage across primary coil, number of turns in primary coil, voltage across secondary coil and number of turns in secondary coil?
Voltage across primary coil / voltage across secondary coil
=
Number of turns in primary coil / number of turns in secondary coil
What links voltage across primary coil, current in secondary coil, voltage across secondary coil and current in primary coil?
Voltage across primary coil X current in Primary coil
=
Voltage across secondary coil X current in secondary coil
What links volume, pressure and constant (for gases)?
Constant = pressure x volume
p V = constant
