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WORK-ENERGYUnit =
11, Dr.
John P. Cise, Professor of Physics, Austin Com. College, 1212 Rio Grande St=
.,
Austin, Texas 78701 jpcise@austincc.edu & New York Times by Alan Schwarz
New Twist Keeps Dickey’s Career
Afloat
Jeff
Topping for The New York Times
R. A.=
Dickey,
who is hoping to make the Mariners, shows his knuckleball grip, which he
developed last season in Class AAA.
By ALAN SCHWARZ Published: February 27, =
2008
PEORIA, Ariz. — By all rights, R. A. Dickey should =
be
working a day job somewhere, cursing twisted fate. Or he should be coaching=
at
some Tennessee high school, telling kids what he once was and lamenting what
might have been. Skip to next par=
agraphInstead, Dickey slipped on his Se=
attle
Mariners uniform Monday, stepped on a bullpen pitcher’s mou=
nd
and made his pitching arm do something it should not be able to do —
throw a baseball. In an age when more and more pitchers have ugly scars
crawling up their elbows, where surgeons’ scalpels have replaced thei=
r ulnar collateral ligaments=
in what is known as Tommy John surgery, Dickey does not need to worry about
strains or painful pops. He does not have an ulnar collateral ligament in his right el=
bow.
None. Dickey either was born without one, or the tissue simply disintegrated
when he was a teenager. ̶=
0;For
him to be able to throw at all is pretty phenomenal in itself,”=
;
said Rick Griffin, the Mariners’ head athletic trainer. Dickey, a hus=
kily
bearded father of three, said: “Doctors look at me and say I
shouldn’t be able to turn a doorknob without feeling pain, and I shou=
ldn’t
be able to turn the key and start my car without feeling pain. But I’m
still here. I feel I have a whole career ahead of me.” After pitching
professionally for 12 years without any elbow discomfort to speak of, the m=
an
who was told the joint would never hold up can pitch almost every day if
needed. “It’s a real blessing now,” Dickey said.
“I’m real resilient, simply because I don’t have to worry
about that ligament being sore, or tearing it. There’s nothing to
tear.” Dickey was ready to accept the Rangers’ $810,000 bonus o=
ffer
when a team physician picked up the magazine and noticed Dickey’s rig=
ht
arm hanging somewhat awkwardly at his side. The doctor recommended that the
team examine him further, leading to the bizarre discovery that Dickey not =
only
had an elbow issue, he had no=
ulnar
collateral ligament, the primary tissue that stabilizes the joint.=
u>
Dickey moved up the minor league ladder steadily, never
experiencing arm issues, and reached the major leagues in 2001. He relieved=
and
spot started for the Rangers for most of 2003 and 2004, posting E.R.A.̵=
7;s
over 5.00 and standing out mostly for his strange and unclassifiable forkba=
ll,
known as “the thing.”
By
2005, Dickey realized that the only way to keep his career alive was to suc=
cumb
to the knuckleball and try to perfect it. The Rangers coach Charlie Hough, a
former knuckleballer, helped him alter his homemade grip into one more
conventional, and Dickey finally got the hang of it after signing with the
Brewers for last season. Dickey’s knuckleball travels at a zippy 77 miles an hour,
about 10 m.p.h. faster than the one thrown by the Boston Red Sox’ Tim Wakefield, the majors’ prototype knuckleballer for t=
he
past 15 years. As Dickey threw it during his bullpen session Monday, he did=
so
not far from J. J. Putz, the Mariners’ gas-heaving closer, who later
marveled that his new teammate could throw at all. “I’m startin=
g to
wonder if we really need that ligament,” Putz said with a laugh. R=
20;We
should all just get ours cut out. Our arms would never get sore.” Sure
enough, Putz spoke with several pounds of ice strapped onto his shoulder and
elbow, and an electronic gizmo monitoring its effects. A few lockers away,
Dickey buttoned his shirt unencumbered, eager and ready to pitch again.
Question:=
Using
work-energy concepts find the average force(F) Dickey’s elbow joint M=
UST
exert on his forearm(7.5 lb.)=
while sto=
pping a
77 mph pitch(note: 88 ft/s =3D 60 mph) over a distance of 12 feet (linear &=
amp;
horizontal throw).
Answer: <=
/span>~ 124.5 pounds. Comment: When
throwing a pitch not only is the ball moving at 77 mph, but the forearm was
since it was the device which threw the ball. The forearm does stop due to =
the
fact it is attached to the upper arm at the elbow.
 =
;
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