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weight formula
w=mg
weight units
N (newtons)
mass units
kg, g
gravity units
N/kg
density formula
ρ=m/v(volume)
density units
kg/m³
volume units
m³
average speed formula
Vavg=d/t
average speed units
m/s
distance units
meters, miles, km
time units
s, min, hr
acceleration formula
a=Vf-Vi/t
acceleration units
m/s²
velocity units
m/s
spring force formula
Fs=kx
spring force units
N (newtons)
spring constant units
N/m
extension units
m
resultant force formula
(wiggle thing)F=ma
resultant force units
N (newtons)
pressure formula
p=f/a(area)
pressure units
N/m²
force units
N (newtons)
area units
m²
moment formula
Moment = force x distance from pivot
moment units
Nm
kinetic energy formula
E.k. = ½ mv²
kinetic energy units
J (joules)
gravitational potential energy formula
G.P.E = mgh
gravitational potential energy units
J (joules)
work formula
W = ΔE or W = Fd
Work units
J (joules)
power formula
P = ΔE/t
power units
J (joules)
efficiency formula
eff = useful E output/total E input x 100%
wave speed formula
V = fλ
wave speed units
m/s
refractive index formula
n = speed in vacuum/speed in medium
or
n = sin i/sin r
frequency formula
f = N/t (N - # of waves)
frequency units
Hz
speed formula
V = d/t
magnification formula
magnification = image size/actual size
mm to µm
x1000
Note
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