|
| |
|
UNKNOWN |
KNOWN |
FORMULA |
|
average velocity
|
distance, time
|
Vav
= Dd
Dt
|
|
distance
|
average velocity,
time |
d =
Vav
·
Dt
|
|
time
|
average velocity,
distance |
t =
Dd
Vav
|
|
acceleration
|
final velocity,
time, initial velocity |
a =
(Vf – Vi)
/ t
|
|
final velocity
|
acceleration, time,
|
Vf
= Vi + a • t |
|
|
initial velocity
|
|
|
distance
|
acceleration, time
|
d =
Vi • t + ½ • a • t2
|
|
force
|
mass, acceleration
|
F =
m • a |
|
acceleration
|
force, mass
|
a =
F
m |
|
mass
|
force, acceleration
|
m =
F
a |
|
weight
|
mass, gravity
|
wgt
= m ·
g
|
|
mass
|
weight, gravity
|
m =
wgt
g |
|
gravity
|
weight, mass
|
g =
wgt
m |
|
work
|
force, distance
|
W =
F • d
|
|
power
|
force, distance,
time |
P =
F • d
t |
|
kinetic energy
|
mass, velocity
|
K.E.
= ½ m • v2
|
|
potential energy
|
mass, gravity,
height |
P.E. = m • g • h
|
|
projectile height
|
velocity, gravity
|
h =
V2
2 ·
g |
|
final velocity of
projectile |
fall distance,
gravity |
Vf
= Ö (2 • g • d) |
|
fall time of
projectile |
fall distance,
gravity |
t =
Ö (2 • d / g) |
|
SUBJECT |
MKS |
CGS |
ENGLISH |
|
mass (m)
|
kilogram (kg) |
gram (g) |
slug
|
|
distance (d)
|
meter (m) |
centimeter (cm) |
foot (ft)
|
|
time (t) |
seconds (s) |
seconds (s) |
seconds (s)
|
|
velocity (V)
|
m/s |
cm/s |
ft/s |
|
|
|
|
|
|
acceleration (a)
|
m/s2 |
cm/s2 |
ft/s2 |
|
|
|
|
|
|
gravitational
|
9.8 m/s2 |
980 cm/s2 |
32 ft/s2 |
|
acceleration(g)
|
|
|
|
|
force (F)
|
newton
(N) |
dyne |
pound |
|
|
[kg m/s2] |
[g
cm/s2] |
[slug ft/s2] |
|
|
|
|
|
|
work (W) |
joule (J)
[kg m2/s2] |
erg
[g cm2/s2] |
ft
lb
[slug ft2/s2] |
|
|
|
|
|
|
power (P) |
watt (W) |
erg/s |
ft•lb/s
|
|
|
[J/s]
|
|
|
|
kinetic energy
(K.E.) |
joule |
erg |
ft•lb
|
|
|
|
|
|
|
potential energy
|
joule |
erg |
ft•lb
|
|
(P.E.) |
|
|
|
Notes:
weight
is a special case of force
1 horsepower = 550
ft•lb/s = 745.7
watt
gravity
(g) = gravitational acceleration (on Earth)
|
