Siyraghey

Ta'n siyraghey, ny bieauaghey keayrtyn, ny chormid arraghee t'ayn tra dy vel tappeeys ny bieauid nhee arraghey.

Ta formley ry-gheddin lesh y mooad d'obbraghey magh myr ta:

bieauaghey = arraghey bieauid / am gowit gys y bieauid d'arraghey

ny

$\mathbf {\bar {a}} ={\mathbf {v} -\mathbf {u} \over t}$

'Sy chooish shoh

a = bieauaghey

u = bieauid hoshee

v = bieauid yerrinagh

t = am gowit

T'ad ny h-unnidyn ta gowit lesh y bieauaghey na meaderyn 'sy tullagh ny kilomeaderyn 'syn oor myr ta m/s as km/h.