03. Physics Equations Flashcards
Weight
W
Weight = mass x gravitational field strength
W = m x g
Work done
W
Work Done = force x distance (along line of action)
W = F x s
Force applied to a spring
F
Force applied to a spring = spring constant x extension
F = k x e
(Physics Only) Moment of a force
Moment = force x distance
M = F x d
(Physics Only) Pressure
P
Pressure = force normal to a surface / area of that surface
P = F / A
Distance travelled
s
Distance = speed x time
s = v x t
Force
F
Force = mass x acceleration
F = m x a
Acceleration
a
Acceleration = change in velocity / time taken
a = Δv / t
Momentum
p
Momentum = mass x velocity
p = m x v
Kinetic energy
Ek
Kinetic Energy = 1/2 x mass x (velocity)2
Ek = 1/2 x m x v2
Gravitational potential energy
Ep
Gravitational Potential Energy = mass x gravitational field strength x height
Ep = m x g x h
Power
P
Power = energy transferred / time
P = E / t
Power
P
Power = work done / time
P = W / t
Power
P
Power = potential difference x current
P = I x V
Power
P
Power = current2 x resistance
P = I2 x R
Efficiency (Energy)
= Useful output energy transfer / total input energy transfer
Efficiency (power)
= useful power output / total power input
Wave speed
v
Wavespeed = Frequency x wavelength
v = f x λ
Charge flow
Q
Charge flow = current x time
Q = I x t
Potential difference
V
Potential Difference = current x resistance
V = I x R
Energy transferred
E
Energy = power x time
E = p x t
Energy transferred
E
Energy transferred = charge flow x potential difference
E = Q x V
Density
ρ
Density = mass / volume
ρ = m / V
