That's correct! A force is absolutely necessary to change the motion of an object. This is a fundamental principle in physics known as Newton's First Law of Motion (also known as the Law of Inertia).

Here's a breakdown:

* Inertia: An object at rest will stay at rest, and an object in motion will stay in motion at a constant velocity (speed and direction), unless acted upon by an unbalanced force.

* Force: A force is a push or pull that can change the motion of an object. It can cause an object to start moving, stop moving, change direction, or change speed.

Examples:

* Pushing a box: To get a box moving, you need to apply a force (push) to overcome its inertia.

* Stopping a car: To stop a car, you need to apply a force (brake) to slow it down.

* Turning a corner: To change the direction of a car, you need to apply a force (steering wheel) to turn it.

Key Points:

* Unbalanced forces: A change in motion requires an unbalanced force. This means the force acting on the object needs to be greater than any opposing forces (like friction).

* Magnitude and direction: Forces have both magnitude (strength) and direction.

Let me know if you'd like to explore specific types of forces, or any other concepts related to motion and forces!