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C​entr​ipetal Force 

Whenever an object moves in a circular path we know the object is accelerating because the velocity is constantly changing direction.  All accelerations are caused by a net force acting on an object.  In these cases the net force is a special force called the centripetal force.Centripetal Force is the force perpendicular to the velocity and is toward the center of the circle. It is what causes an object to move in a circle 

What is Centripetal Force?

In this picture, the object's velocity wants to go in a straight line so if the string is cut the ball ends up where point A is not point B. The speed throughout is constant, but the velocity or direction changes.

What is Centripetal Acceleration?

The acceleration of an object moving in a circle due to centripetal force.

In this video, Evan is able to swing the bucket full of water over his head.  As a bucket of water  is spun in a circle, the tension force acting upon the bucket provides the centripetal force required for circular motion.

Click on Centripetal force for more information 

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