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NEWTON’S 2ND LAW & KINEMATIC=
S Units 6,7
and some 4 & 5
Dr. John P. Cise, Pro=
fessor
of Physics, Austin Community College, 1212 Rio Grande St., Austin Tx. 78701
jpcise@austincc.edu=
&=
NYTimes Sept. 12, 2011 by Alan Schwarz.<=
/span> Send=
me a e-mail informing me of the use you got from this
application. Thanks. Dr Ci=
se
INTRO=
DUCTION: 3 LB human brains in football<=
o:p>
collisions =
go from
40 mph(88 ft/s =3D 60 mph) to 0 and produce 120 g’s(1 g =3D -32 f=
t/s2)
of deceleration. This is stated below. QUESTIONS: (a) Find initial speed of brain=
in ft/s? (b) Convert 120 g’s into –ft/s<=
sup>2?
Note g =3D 32 ft/s2 on earth. (c=
)Find
the stopping distance (in ft) of the brain if it went from 40 mph to 0 =
with
120 g’s of deceleration? (d) Convert answer (c) to inches and does
this look reasonable as a stopping distance? (e) Find time for brain to
stop? (f) Find the mass of brain? (g) Find the force on brain stopping =
from
40 mph to 0 at 120=
g’s? Ans=
span> :Below
|
|
For Head Injuries, a Problem in Practice
Alabama offensive l=
inemen
run drills during a practice. A study showed that college players sustain m=
ore
total hits to the head in practices than in games.
ANSWERS:(a) ~ 5=
8.67
ft/s ,(b) ~ - 3890 ft/s2,(c) ~ 0.45 ft.,(d) ~ 5.38 inch, (e)=
~
0.0153 s., (f) ~ 0.094 slugs.,(g) 360 lb
|
|
As discussion about the effects of brain trauma in football tu=
rns
to avoiding it in the first place, ideas for reducing hits to the head incl=
ude
eliminating the three-point stance for linemen and strengthening rules
regarding headfirst tackles. But the adjustment that many see as the easiest
and most practical to make, given that football’s appeal derives in p=
art
from its violence, is limiting the number of hits to the head in practice,
which data show can be as punishing as the games themselves. News Analysis: Eagles’ Handli=
ng of
Head Injury Draws Spotlight
(September 16, 2010) According to a s=
tudy
of three Division I college teams that will be published this month in the =
Journal of Athletic Training=
span>, and =
was
sponsored by the National Institutes of Health<=
/span>, coll=
ege
players sustain more total hits to the head in practices than in games. Dur=
ing
a full season of practice, each team averaged 2,500 total hits to the head =
that
measured as significant blows (50 to 79 g’s of force) and about 300 h=
its
to the head that were considered in the concussion-causing range (80 to 119
g’s). Each team experienced almost 200 practice colli=
sions
that measured above 120 g’s, which experts have like=
ned to
crashing a car into a concrete wall at 40 miles an hour. =
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