We use words like acceleration, steady speed and stationary to describe motion. In your Standard grade Physics course you are expected to know that it is the forces acting on a body that cause the motion of the body to be either changing or unchanging. You are also expected to know how to use Newton' s First Law and Second Law in explaining different types of motion. You may wish to print a hard copy for your reference.
Balanced forces are responsible for unchanging motion.
A tug of war, where each team is pulling equally on the rope, is an example of balanced forces. The rope is stationary under the action of these balanced forces. It also includes motion where the direction in which the body moves is changing ie the body is moving in a curved path. The lift-off of space shuttle is an example of an unbalanced force in action. The space shuttle accelerates upwards from its launch pad.