balaaghoorn

bal F, balaaghoorn τ, rekheeya sanveg p, tatha koneeya sanveg L mein sanbandh ; dhyaan dein ki yahaaain ghoornan ek hi tal mein seemit hai.
Torque-vectors.svg

kisi bal dvaara kisi vastu ko kisi aksh ke parit: ghumaane ki pravrutti (tendency) ko balaaghoorn (Torque, moment ya moment of force) kehte hain.
paarshv chitr mein bal F' ka bindu O ke saapeksh balaaghoorn M hai to -

jahaan r bindu O ke saapeksh bal F ki kriyaarekha par sthit kisi bindu ka sthiti sadish (position vector) hai. mote taur par balaaghoorn ka arth kisi vastu (bolt ya flaaivheel) par lagne wala 'ghoornan bal' (ghumaane wala bal) hota hai. udaaharan ke liye jab kisi paane (rinch) ke haindil ko kheenchate ya dhakka dete hain to isse ek balaaghoorn utpann hota hai jo nat ya bolt ko dheela karta hai ya kasata hai.

baahari kadiyaaain