Physics for IGCSE & O level - Forces And Motion (Section 12 - No. 21)
What is the relationship between the direction of the centripetal force and the velocity of an object moving in a circle?
The force and velocity are in the same direction.
The force and velocity are in opposite directions.
The force is perpendicular to the velocity.
The force and velocity are at an angle of 45 degrees.
Explication
The centripetal force is always directed towards the center of the circle, and velocity is tangential to the circle; hence they are perpendicular.