P1 2 3 8 9 10 - Equations (for upcoming test [unfinished]) Flashcards
Kinetic energy
Kinetic energy = 0.5 x mass x speed^2 (velocity)
Ek = 0.5 x m x v^2
GPE
GPE = mass x gravitational field strength x height
Ep = mgh
Power (energy)
Power = work done / time taken = energy transferred / time taken
Power = W/t = E/t
Efficiency
Efficiency = useful Energy output / total Energy output
Efficiency = useful Power output / total Power output
Charge flow
Charge flow = current x time
Q = I t
Potential difference
Potential difference = current x resistance
V = I R
Total resistance
Total resistance = resistance of component 1 + resistance of component 2
Rt = R1 + R2
Power (electricity)
Power = current x potential difference
P = I V
Power = (current)^2 x resistance
P = I^2 R
energy transferred
energy transferred = power x time
E = Pt
energy transferred = charge flow x potential difference
E = QV
Density
Density = mass / volume
p = m/V
Weight
Weight = mass x gravitational field strength
W = m g
Work done (forces)
Work done = force x distance (moved along the line of action of the force)
W = F s
Force
Force = Spring constant x extension
F = ke
Moment of a force
Moment of a force = force x distance (perpendicular to the direction of the force)
M = Fd
Pressure
Pressure = force normal to a surface / area of that surface
p = F/A
