Tangential acceleration is d/dr mcV = mc dVcdt = mdv/dt. The tangential acceleration is dV/dt is produced from the Vector Energy (mcV, the "Dark Energy").

Newton "added" the tangential acceleration as " dV/dt" to balance he Gradient acceleration v2/r 1R.

Because there is no tangential force acting on the object

in uniform circular motion.

The proof that there is no tangential component of acceleration is

the fact that the tangential component of velocity is constant.

Answer Both refer to an object that is in a cirular motion. Radial Acceleration is a velocity change of the object as it moves away from the center of rotation. Tangential Velocity is a change of velocity of the object as it moves in a line that is tangential to the circular path it is moving.

Yes. Imagine a ball on a rigid pole being swung around, and slowing down. It's tangential velocity is positive but it's tangential acceleration is negative

Vt=w*r

where;

* is multiply

Vt is tangential velocity

w is omega(angular mometum)

r is radius