Notice the motion of the ball after the string is cut.
A wooden ball is attached to the rim of a spinning wheel.
The ball is held in place by a string.
After the spring is cut, the ball flies upward in a straight line
tangent to the wheel, initially with the same speed
it had when in uniform circular motion.
In the camera's frame of reference, the ball constantly accelerates around
in a circle due to the centripetal force
pulling it inwards (Newton's second law).
When the string is cut, the acceleration stops,
and the ball flies away in a straight tangential line
(Newton's first law).