If i have no velocity in one direction then there is no

[a_helal]

if i have no velocity in one direction then there is no acceleration ?
i deal with acceleration for sphere in fluid so i use spherical polar co ordinates (ρ,θ,Φ)
i have no velocity in Φ then there is no acceleration in Φ direction ?
i want to be sure

 

[bassguitar]

Well you can't make that conclusion...imagine you have a ball thrown vertically...at the top it has no velocity but has acceleration g...so what I mean is that the current velocity in certain direction might be 0 but that does not mean that there is no acceleration in the direction...it depends on the problem of course :)

 

[a_helal]

ok thanks
i understood