Is acceleration constant when a disk is rolling down a ramp?

[goomer]

I don't understand when acceleration is constant and when it changes. What are some examples of situations where the acceleration is constant and when it's not? Is acceleration constant when a disk is rolling down a ramp?

 

[Pythagorean]

tell us first how acceleration is related to velocity

 

[goomer]

velocity/time = acceleration

 

[Pythagorean]

more particularly, it's the change in velocity over the change in time. So if you have a constant acceleration, you have a velocity that is changing with a constant rate.

Now, what are the forces on the disk? Do you know Newton's second law?