Motion of pendulums in Vacuum.?

According to newton's law an object in motion will continue to be in motion and an object at rest will continue to stay at rest unless an unbalance force is applied. So this means that an object at rest having zero velocity will continue to have zero velocity and a moving object will continue to have X velocity. As velocity is a vector quantity depending upon direction and magnitude, if the direction of an object, stationary or in motion is changed, its velocity will change, or the speed (magnitude) of the body changes, its velocity will change, and the force which causes this change will be that unbalanced force mentioned in newton's law. so what about a pendulum? it is commonly said that pendulum's will continue to be in motion in vacuum where there are no unbalanced forces (friction, and ignoring the friction about the pivot) to stop its motion, as per newton's law of inertia. but isn't it so, that pendulums change their direction of motion, and hence their velocity, every second? If we draw tangents on the circular path that the pendulum follows in its motion, they will all go in different directions. So how can we say that it is not changing its motion, even though there are no unbalanced forces, and newton's law rules here?