key equations Flashcards
word equation, symbol equation and unit
Average speed =
total distance/ total time
s = d / t
m/s
word equation, symbol equation and unit
Force =
mass x acceleration
F = ma
N
word equation, symbol equation and unit
Acceleration =
change in velocity / time
a = (v-u) / t
m/s2
word equation, symbol equation and unit
Density =
mass / volume
p = m/v
kg/m3
word equation, symbol equation and unit
Pressure =
force / area
P = F/A
Pa
word equation and unit
Moment =
Force x perpendicular distance
Nm
word equation, symbol equation and unit
Charge =
current x time
Q = It
C
word equation, symbol equation and unit
Voltage =
current x resistance
V = IR
V
word equation, symbol equation and unit
Energy Transferred =
charge x voltage
E = QV
J
word equation, symbol equation and unit
Power =
current x voltage
P=IV
W
word equation and unit
Wave speed =
frequency x waveleangth
m/s
word equation and symbol equation
Refractive index =
sin (angle of incidence) / sin (angle of refraction)
n = sin i / sin r
word equation and symbol equation
Sine (critical angle) =
1 / refractive index
sin c = 1 / n
word equation
Efficiency =
Useful energy or power OUT / total energy or power IN
word equation, symbol equation and unit
Pressure =
density x gravity x depth
P static = pgh
Pa or N/m2
