Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: To change the motion of an object, inertia must be overcome by an unbalanced force acting on the object. Until the soccer player kicks the ball in Figure below , the ball remains motionless on the ground. However, when the ball is kicked, the force on it is suddenly unbalanced. The ball starts moving across the field because its inertia has been overcome. Answer: inertia
A:
What must be overcome to change the motion of an object?