A
force that keeps an object at a fixed angle is called centripetal force.
Centripetal force refers to a movement of an object in a circular motion. The
velocity of an object is changing in direction but the magnitude remains. The
force of an object stays on the center; the velocity of an object depends on
the mass of an object.
One example is swinging a rope. The velocity will depends on how heavy the
object you will put on the end of the rope. The heavier the object the faster
it will rotate.