Txhua lub suab poob, nco ntsoov, ua tsaug rau lub ntiajteb txawj nqus. Plaub-seam fastballs, nyob ntawm lawv qhov nrawm thiab txav mus los, poob qee yam xws li 10 mus rau 25 ntiv tes ntawm lawv txoj kev mus rau lub phaj. Curveballs, qhov nruab nrab, feem ntau poob ntawm 40 mus rau 70 ntiv tesRaws li koj tuaj yeem pom, txhua qhov pitches poob rau qee qhov.
Vim li cas qhov nkhaus pob poob?
Curveballs nkhaus - los yog tawg downward - vim lub spin imparted los ntawm lub pitcher li nws flings nws mus rau lub tsev phajTxoj kev Briggs piav nws, kev sib hloov ntawm seams tsim ib tug "whirlpool" ntawm huab cua nyob ib ncig ntawm lub pob thiab ua rau lub siab qis dua ntawm ib sab.
kab nkhaus mus li cas?
Curveballs, tshaj tawm thiab siab
As lub pob tig, nws thawb cov huab cua ib puag ncig hauv tib lub moos. Kev sib txhuam ntawm lub pob spinning thiab huab cua ua rau huab cua molecules ntawm sab xis ntawm lub pob txav mus rau sab xis. Cov huab cua molecules ntawm sab laug ntawm lub pob txav mus tom ntej.
nkhaus pob ua dab tsi?
A curveball is a tawg pitch uas muaj zog ntau dua li ntawm lwm lub suabNws yog pov qeeb qeeb thiab nrog tag nrho tag nrho so dua li tus swb, thiab nws yog siv los khaws hitters off-balance. Thaum ua tiav los ntawm lub pitcher kom raug, lub batter uas xav tau lub pob nrawm yuav nrawm dhau thiab dhau ntawm qhov nkhaus pob.
Yuav tsum muaj 13 xyoos pov pob nkhaus?
James Andrews (tus kws kho mob orthopedic renowned thiab tus thawj coj kho mob rau lub koom haum Andrews) qhia tias cov tub ntxhais hluas pitchers tsis txhob cuam tshuam cov curveballs mus txog thaum lawv tau paub lub fastball thiab hloov pauv thiab yog tsawg kawg yog 14 xyoo 4.
