Demonstrating the Directions of Tangential Velocity and Acceleration (5:57)
The best way to understand how tangential velocity and tangential acceleration are related is to visualize from above. Will you look at that! This video does exactly that.
This is an AP Physics 1 topic.

Content Times:
0:10 Visualizing up the three parts of the demonstration
0:51 Visualizing the tangential velocities
1:41 Visualizing the tangential accelerations
3:11 Visualizing tangential velocities and accelerations simultaneously
4:52 Angular vs. Tangential quantities