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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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