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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
GENERAL INFORMATION
Inertia
Inertia is that property of a body which causes it to tend
to continue in its present state of rest or motion, unless acted
upon by some force.
Micrographs
Micrographs are obtained by polishing the surface of a
metal, etching the polished surface with a suitable reagent to
bring out the metallographic structure, then reproducing,
usually by photographic methods, the appearance of the
surface as seen through the microscope. Photomicrograph
and
microphotograph
are
terms
sometimes
used
for
micrographs made by a photographic process.
Momentum
The momentum of a moving body is the intensity of
that constant force which, resisting its movement, would bring
it to rest in one second.
Momentum = mass X velocity in feet per second
Momentum = weight X velocity in feet per second
32.16
Momentum should not be confused with the moment of a
force.
Motion, Newton's Three Laws
1st Law: Every body continues in a state of rest or uniform
motion in a straight line, except if it is acted upon by a force to
change its state of motion or rest.
2nd Law: If a body is acted upon by several forces, it is acted
upon by each of these as if the others did not exist. This is
true whether the body is at rest or in motion. In other words, if
two or more forces act upon a body at the same time, each
produces exactly the same effect as if it acted alone; the total
effect or resultant motion of all the forces may be found by a
diagram in the same way as the resultant of forces is found.
3rd Law: To every action there is always an equal reaction or,
in other words, if a force acts to change the state of motion of
a body, the body offers a resistance equal and directly
opposite to the force.
Physics
The science of phenomena of inanimate matter involving no
chemical
changes,
comprising
mechanics,
magnetism,
electricity, light, heat and sound.
Pi-p
The 16th letter of the Greek alphabet, corresponding to
the English P, is used as a constant to denote the ratio
(3.14159+) of the circumference of a circle to its diameter.
Pneumatics
That branch of physics treating of the mechanical
properties of air and other gases, as of their weight, pressure,
elasticity, etc.
Refrigerant
A substance which produces a refrigeration effect by its
absorption of heat while expanding, vaporizing or evaporating.
Evaporation is a cooling process.
Static Balance
Balancing of crankshafts is a very important factor in
providing long engine life. Crankshafts must be balanced for
equalization of weight so that when supported on knife blades
the shaft will not revolve. This is the same condition of
balance that would obtain with an automobile wheel if a slight
counterweight were placed directly opposite the valve stem so
that the wheel, if jacked up and given a spin, would stop and
remain stationary wherever it was overtaken by inertia after
the energy from the force of the spin had spent itself. If not in
perfect balance, the wheel would either turn over another
revolution or turn back until the heavy point was down.
CTS-2128-L Page 11
PRINTED IN UNITED STATES OF AMERICA
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