Tangential force may be defined as the force which acts on a moving body in the direction of the tangent to the curved path of the body.
If the velocity of the object is positive, then the acceleration will be negative.
the equation shows how an unbalanced force must be acting to cause negative acceleration or deceleration. The force produced is called a tangential force.
Production of tangential force:
It is a result of tangential acceleration which is perpendicular to the radius coming from the axis of rotation. The tangential force exists only when there is a change in tangential velocity.
The difference between tangential force and normal force is that, in tangential force the magnitude of the velocity changes while in normal force direction of velocity changes at every point.