Think of the conker on a string. If the tension is removed, then the circular path will not be maintained.
This force acts towards the centre of the circle and is referred to as the CENTRIPETAL force.
This is an unbalanced force and is responsible for the conker changing direction constantly.
It thus causes the velocity to change.
The centripetal force therefore causes an acceleration that acts towards the centre of the circular path.
The force and acceleration MUST be at right angles, TOWARDS the centre.
Increasing the object's mass, increasing the object's speed, and decreasing the radius of the circle, all increase the centripetal force.
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