Homework Help: Equal to zero if angular velocity is constant

1. The problem statement, all variables and given/known data

Which is equal to zero if angular velocity is constant, normal or tangential acceleration?
The one with zero angular velocity is a crank. The crank moves at a fixed point.

2. Relevant equations



3. The attempt at a solution

 

Re: acceleration

I think it is the tangential one because that means it is a uniform motion but continuously changing speed? is that correct?

 

Re: acceleration

sorry it should be constant velocity. changing direction but constant speed, right?

 

Re: acceleration

velocity is changing. If that is changing, acceleration is also changing?

 

Re: acceleration

Normal acceleration is always towards the fixed point. The normal one?

 

Re: acceleration

Can you give a summary on how to determine which is zero among the two in different situations?

How can I determine the tangential acceleration if I have given the angular velocity?

 

Re: acceleration

so, if normal is zero, then tangential equals the angular acceleration. I only depend on the tangential and normal formula.

 

Re: acceleration

so normal is zero in a sliding block?

 

Re: acceleration

i mean in a mechanism, in a flat surface. the sliding block has zero normal? I'll be back.

 

Re: acceleration

I mean in a mechanism, the sliding block, the normal in a flat surface is zero?