must there be an unbalanced net force acting on any moving object?
Do you mean to move it or not move it?
to move it
An unbalanced force will accelerate the system. Balanced forces keep the object in constant motion, which is usually still, but it could be in motion at CONSTANT velocity and zero Acceleration.
The idea is NetForce=mass*netacceleration.
Acceleration is zero if the forces are balanced, or Net force is zero.
yes.
To determine whether there must be an unbalanced net force acting on any moving object, we can refer to Newton's first law of motion, also known as the law of inertia.
Newton's first law states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity in a straight line unless acted upon by an external force. This concept is often summarized by the statement: "An object in motion tends to stay in motion and an object at rest tends to stay at rest."
Based on this law, we can conclude that if an object is moving at a constant velocity in a straight line, then the net force acting on it is balanced. In other words, there is no unbalanced net force acting on the object.
However, if the object is accelerating or decelerating (changing its velocity), there must be an unbalanced net force acting on it. This force is responsible for causing the change in the object's motion.
So, in summary, an unbalanced net force is required to accelerate or decelerate a moving object. If the object is moving at a constant velocity in a straight line, then the net force acting on it is balanced.