Mass is the
amount of
matter in a
substance.
Weight, a force,
is the effect of
gravity acting
on it.
MASS /
WEIGHT
UNITS
Imperial: pounds
(lb)
Metric: Grams
(g, kg)
English/British:
Slugs or pound
mass (lbm)
 The newton (symbol: N) is the International System of
Units (SI) measurement of a unit of force.
 One newton is the force needed to accelerate (move)
one kilogram of mass at the rate of one meter per
second squared.
 𝑁𝑒𝑤𝑡𝑜𝑛𝑠 =
𝑘𝑔𝑟𝑎𝑚𝑠∗𝑚𝑒𝑡𝑒𝑟𝑠
𝑆𝑒𝑐𝑜𝑛𝑑𝑠 2
Or 𝑁 = 𝑘𝑔 ∗
𝑚
𝑆2
ENERGY
IS
The capacity to
do work
When energy is
transferred,
things happen
LAW OF
CONSERVATION
OF ENERGY
Energy cannot be
created or destroyed,
only transferred.
Its form can be changed
Often it is converted to
heat.
The energy an object has
due its vertical position
(usually through gravity)
PE = mgh
m = object’s mass (lb, kg,
slugs)
g = gravitational constant
𝑚
2)
𝑠
𝑓𝑡
2)
𝑠
(9.8
or (32
h = vertical height of object
The energy a moving object
possesses by virtue of its
motion.
KE = ½ mv2
m = mass (lb, kg, slugs)
v = velocity (
𝑚 𝑓𝑡
,
𝑠 𝑠
)
MECHANICAL
ENERGY
(ME)
Mechanical Energy is the
total of potential energies
(height/gravitational,
other) and kinetic energy
ME = PEg + PEo + KE
MEin = MEout
Power is the amount of
energy transferred or
converted per unit time.
During the time force acts on an object, the object
moves or changes in some respect.
In mathematical terms:
 The force times the distance the object moves is work.
Work = force x distance
Or
w=fxd
therefore WORK:
Start and stop motion
Change directions
Change shapes
Apogee
KEtop = 0
PEtop = mgh
w = PEtop = KEground
Ground
KEground = ½ mv
PEground = 0
If you want to get a
rocket to a given
height (altitude) you
must get it to a certain
velocity/speed.
LAW OF CONSERVATION OF ENERGY | FORMS OF ENERGY